GHSA-3g36-gf7c-75qw — mattermost-plugin-playboo…
MEDIUMFix: mattermost/mattermost-plugin-playbooks@4c82309GHSA-3g36-gf7c-75qw is a medium-severity (CVSS 6.5) CWE-1287 vulnerability in github.com/mattermost/mattermost-plugin-playbooks. A fix is available for github.com/mattermost/mattermost-plugin-playbooks — see the affected versions and patch details below.
Mattermost Playbooks fails to properly validate the props used by the RetrospectivePost custom post type
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-3g36-gf7c-75qw.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-3g36-gf7c-75qw plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
github.com/mattermost/mattermost-plugin-playbooks🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost-plugin-playbooksReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to properly validate the props used by the RetrospectivePost custom post type in the Playbooks plugin, which allows an attacker to create a specially crafted post with maliciously crafted props and cause a denial of service (DoS) of the web app for all users.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/mattermost/mattermost-plugin-playbooks | ≥ 2.0.0 | No fix |
| 🐹Go | github.com/mattermost/mattermost/server/v8 | all versions | 8.0.0-20250218121836-2b5275d87136go get github.com/mattermost/mattermost/server/v8@v8.0.0-20250218121836-2b5275d87136 |
| 🐹Go | github.com/mattermost/mattermost/server/v8 | ≥ 10.4.0 | No fix |
| 🐹Go | github.com/mattermost/mattermost/server/v8 | ≥ 10.5.0 | No fix |
| 🐹Go | github.com/mattermost/mattermost/server/v8 | ≥ 9.11.0 | No fix |
| 🐹Go | github.com/mattermost/mattermost-plugin-playbooks | all versions | 1.41.0go get github.com/mattermost/mattermost-plugin-playbooks@v1.41.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost-plugin-playbooks, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
No patched version of github.com/mattermost/mattermost-plugin-playbooks has shipped for GHSA-3g36-gf7c-75qw yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-3g36-gf7c-75qw can be triaged on real exposure rather than presence alone.
Tailored to GHSA-3g36-gf7c-75qw. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-3g36-gf7c-75qw in your dependencies?
O3 Security finds GHSA-3g36-gf7c-75qw across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.