Definition
Purple teaming is a security exercise where the attackers, usually called the red team, and the defenders, usually called the blue team, work together in the same room or the same real-time session rather than operating separately and comparing notes only after the fact. The red team runs actual attack techniques, the blue team tries to detect and respond to them as they happen, and instead of the red team going off, doing everything, and delivering a report weeks later, both sides talk through what worked, what got detected, and what slipped through, while the exercise is still happening or immediately after each specific technique is tried.
Purple teaming exists because the traditional separate red team and blue team model, while useful, has a real weakness: the blue team often only finds out what happened well after the exercise ends, when a final report lands, by which point the specific context of what was tried and why has gone cold. Organizations noticed that a lot of value was being left on the table between the moment an attack technique succeeded or failed and the moment the defenders actually learned about it, and closing that gap became the whole point of running the two teams together instead of in sequence.
What separates purple teaming from just having a red team debrief the blue team afterward is the tightness of the feedback loop and the shared goal. A traditional red team engagement treats detection by the blue team as something to avoid, since the point is often to see how far an attacker can get without being caught. Purple teaming flips that incentive: detection is a success to be studied immediately, not an inconvenience to the red team's mission, and both sides are explicitly working toward the same outcome, improving the organization's actual detection and response capability, rather than one side trying to beat the other.
By 2026, purple teaming has become a standard offering alongside traditional red and blue team exercises at most mature security organizations, and it is increasingly seen as more efficient for improving detection specifically, since it produces actionable findings faster than a traditional engagement's after-the-fact report. It has not replaced red team engagements entirely, since there is still value in an unannounced test that mimics a real attacker with no defender cooperation, but purple teaming has carved out a clear role as the faster, more collaborative option when the goal is genuinely improving detection rather than testing whether the blue team notices anything at all.
This page covers how a purple team exercise typically runs, how it compares to running red and blue team exercises separately, what separates it from a straightforward penetration test, and where it earns its place versus where a different exercise fits better. The idea to hold onto is that purple teaming trades some of the realism of a true surprise attack for a much faster improvement cycle, and that tradeoff is exactly right for some goals and exactly wrong for others. Getting that tradeoff right, rather than treating one exercise type as universally better, is the real skill in designing a testing program.
Key Takeaways
- Purple teaming is a collaborative exercise where red team attackers and blue team defenders work together in real time rather than in sequence.
- It exists to close the gap between when an attack technique is tried and when defenders actually learn from it, which a report weeks later leaves open.
- What makes it different from a debrief is a tight feedback loop and a shared goal, treating detection as a success to study rather than something to avoid.
- By 2026, purple teaming is a standard offering alongside traditional exercises, valued for producing actionable findings faster than an after-the-fact report.
- The core tradeoff is realism for speed, giving up some of the surprise of a true attack simulation in exchange for a much faster improvement cycle.
How a Purple Team Exercise Works
A purple team exercise usually starts with agreement on scope, picking specific attack techniques or a specific scenario, such as a particular kind of ransomware behavior or a common phishing follow-up, rather than an open-ended free-for-all. This upfront scoping is different from a traditional red team engagement, where the attackers might have broad latitude to pursue any path to a goal, because purple teaming works best when both sides know roughly what is being tested so they can dig into the details together.
The red team then executes a chosen technique step by step, often pausing after each one, while the blue team watches their own monitoring tools and detection systems in real time to see what fires and what does not. This is the core of what makes purple teaming distinct: the blue team is not trying to catch the red team unaware after the fact, they are actively watching the exact moment a technique runs and comparing what they see against what actually happened.
When a technique goes undetected, which happens regularly and is genuinely useful information rather than an embarrassment, both teams dig into why together, right there. Maybe a detection rule exists but was not tuned correctly, maybe the right log data was not being collected at all, or maybe nobody had written a detection for that specific technique yet. Figuring this out together, with the red team explaining exactly what they did and the blue team explaining exactly what they saw, is faster than either team guessing at the other's perspective from a written report.
The exercise typically produces immediate, specific fixes as it goes, a new detection rule written and tested within the same session, a log source turned on that was missing, or a monitoring threshold adjusted, rather than a list of recommendations to implement someday after the engagement wraps up. This is a meaningful practical difference from a traditional engagement, where recommendations often sit in a report for months before anyone gets around to acting on them. That immediacy is a large part of why organizations that adopt this format rarely go back to running exercises the old way.
Purple Teaming Compared to Separate Red and Blue Team Exercises
A traditional setup runs the red team and blue team as adversaries who do not coordinate during the engagement, the red team tries to get in and stay hidden, the blue team tries to catch them without any advance notice of what is being attempted, and the results get compared afterward in a debrief. This realistically simulates what happens during an actual attack, where the defenders genuinely do not know what is coming, which is exactly the point of running it that way in the first place.
Purple teaming gives up that surprise element deliberately, in exchange for speed and depth of learning about specific techniques. Because both teams know what is being tested and talk through it together, the exercise can cover more ground on detection specifically in less time, and it produces fixes that get tested immediately rather than recommendations that wait for a follow-up engagement to verify. The time saved this way compounds across a program that runs several of these sessions each year, making the format especially attractive for teams operating under real resource constraints.
The tradeoff cuts the other way for testing overall readiness rather than specific detections. A traditional red team exercise, precisely because the blue team has no advance knowledge, tests things purple teaming cannot: whether the blue team notices anything is wrong at all, how they escalate and communicate under genuine uncertainty, and whether their processes hold up when they do not know what they are looking for. Purple teaming answers a narrower but faster question, and a traditional exercise answers a broader but slower one.
Most mature security programs end up using both rather than picking one permanently. Purple teaming works well for quickly hardening detection against specific known technique categories, ransomware behaviors, common phishing follow-ups, particular malware families, while periodic traditional red team exercises test whether the whole detection and response system holds together under genuine uncertainty, which is a different and equally necessary question. Neither approach on its own gives a complete picture of an organization's actual detection and response maturity. Running both, on a sensible schedule, tends to produce the strongest overall program.
What Makes Purple Teaming Different From Penetration Testing
Penetration testing focuses on finding exploitable vulnerabilities, systems, applications, or networks that an attacker could break into, and the deliverable is typically a list of specific weaknesses with enough detail for someone to fix them, a missing patch, a misconfigured server, an exposed credential. Purple teaming focuses on detection and response capability, testing not whether a weakness exists but whether the organization would notice and react appropriately if someone exploited a known attack technique. That difference in focus is also why the two are staffed by people with somewhat different skill sets.
The two can use some of the same technical attack methods, but they are answering different questions. A penetration test asks can an attacker get in through this specific path. A purple team exercise asks if an attacker used this specific technique, would we catch it, and if not, why not. A system can pass a penetration test with no exploitable vulnerabilities found and still fail a purple team exercise badly, because passing the pen test says nothing about whether the security team would notice a technique used through a path the test did not happen to probe.
Penetration testing typically wraps up with a report of findings for someone else, often a different team, to remediate later. Purple teaming, by design, involves the defenders directly and produces improvements to detection during the exercise itself, which means the people doing the testing and the people who benefit from the findings are working side by side rather than communicating through a document handed off afterward. This side by side arrangement is often what makes purple teaming feel faster even when the underlying attack techniques are identical.
Organizations sometimes treat the two as interchangeable ways to check security, running one when they meant to get the value of the other, and end up disappointed. A team that wants to know whether its detection tooling actually works against real techniques needs purple teaming specifically, and a penetration test, however thorough, is answering a related but genuinely different question about exploitable weaknesses rather than detection capability. Getting clear on which question you are actually trying to answer avoids that disappointment before it happens.
Where Purple Teaming Fits and Where It Does Not
Purple teaming fits well for organizations that already have some detection tooling and monitoring in place and want to know whether it actually works against real techniques, rather than assuming it does because it was purchased and installed. It is particularly useful right after standing up a new security tool or writing a new set of detection rules, since it gives fast, direct evidence of whether the investment is doing what it was supposed to do. Skipping this validation step means an organization is essentially trusting a purchase decision rather than any actual evidence.
It also fits well when an organization wants to build detection capability quickly against a specific, known threat, such as a technique used in a recent high profile incident affecting similar organizations. Purple teaming lets a security team go from I am not sure we would catch this to a tested, working detection rule in a single focused session, which is considerably faster than waiting for the next scheduled red team engagement to surface the same gap. That speed advantage is often the deciding factor for teams choosing purple teaming over a traditional engagement in this situation.
It fits poorly as a replacement for testing genuine organizational readiness under real uncertainty, since the collaborative, known-scope nature of the exercise cannot simulate the disorientation of a real, unannounced attack. An organization that only ever does purple teaming and never runs a true surprise exercise may end up with excellent detection rules for specific known techniques and still be caught flat-footed by the confusion of an actual incident, where nobody tells you in advance what technique is coming. Balancing both formats in the same overall program avoids leaning too heavily on either one's particular strengths.
It also fits poorly for organizations with essentially no detection or monitoring infrastructure yet, since purple teaming's value comes from testing and refining detection capability that has to exist first. An organization in that position generally gets more value from building basic logging and monitoring before spending resources on an exercise designed to fine-tune capability that has not been built yet. Building basic visibility first tends to produce far more improvement per hour of effort than an early purple team exercise would.
How to Run Purple Teaming Well
Scope each session around specific, well-defined attack techniques rather than an open-ended goal, and pick techniques based on what is actually affecting organizations like yours, rather than an arbitrary or generic list. A focused session on techniques that matter produces more useful findings than a broad session that tries to cover everything shallowly. A relevant list changes over time as attacker behavior shifts, so building it from real intelligence rather than intuition alone keeps the sessions grounded in current risk.
Make sure both teams genuinely collaborate rather than one team quietly running the show while the other watches. The value comes specifically from the back and forth, the red team explaining exactly what they did, and the blue team explaining exactly what they saw or did not see, in real time. A purple team exercise where the blue team is passive and only receives findings afterward has quietly turned back into a traditional red team engagement with a different name.
Fix what you find during the session whenever possible, writing and testing a new detection rule immediately rather than adding it to a backlog. The immediacy is a large part of what makes purple teaming worth the format, and letting fixes slip into a general backlog loses most of that advantage, turning a fast improvement cycle back into a slow one. The habit of fixing immediately, rather than filing a ticket for later, is what separates purple teaming from a slower engagement with the same content.
Document what was tested and what the outcome was in enough detail that the exercise can be repeated later to verify a fix actually held, since detection rules and monitoring configurations can regress over time as systems change, and a fix verified once during the session is not guaranteed to still be working months later without a way to check. This record also becomes useful evidence when someone later asks whether a past finding was actually addressed, rather than simply assumed to have been handled at the time.
Do not let purple teaming replace your other testing entirely. Keep running periodic traditional red team exercises or genuine surprise tests alongside purple teaming, since the two answer different questions, and an organization that only ever tests detection collaboratively has never actually verified how it performs under real uncertainty, which is a gap that only shows up during an actual incident if it is never tested for beforehand. A program that leans entirely on one format eventually develops a blind spot it does not know it has.
Best Practices
- Scope each purple team session around specific attack techniques that are actually relevant to your organization rather than an open-ended goal.
- Ensure genuine real-time collaboration between red and blue teams, rather than letting one team passively watch the other perform.
- Fix detection gaps found during the session immediately when possible, instead of adding them to a general backlog for later.
- Document tested techniques and outcomes in enough detail to verify later that a fix has held as systems continue to change.
- Continue running periodic traditional red team exercises alongside purple teaming, since surprise testing answers a different question that collaboration cannot.
Common Misconceptions
- Purple teaming is not a replacement for red team exercises; it answers a narrower, faster question about known techniques rather than testing overall readiness under genuine uncertainty.
- Purple teaming is not the same as a red team debriefing the blue team afterward; the collaboration happens in real time, not after the fact in a report.
- Purple teaming is not primarily about finding vulnerabilities, which is the focus of penetration testing; it is about testing and improving detection and response.
- A detection gap found during purple teaming is not a failure of the exercise; finding the gap and understanding why it happened is the actual point.
- Purple teaming does not require a permanent, formally named purple team; it more often describes how an exercise is run, with red and blue working together.
