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Advisory record · GHSA-3g36-gf7c-75qw

Mattermost Playbooks fails to properly validate the props used by the RetrospectivePost custom post type

CVSS 6.5 MediumEPSS 0.0050 · 43rd percentile

Published by the GitHub Advisory Database at 24 Apr 2025, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/mattermost/mattermost-plugin-playbooksGo>=2.0.0 || <1.41.01.41.0
github.com/mattermost/mattermost/server/v8Go<8.0.0-20250218121836-2b5275d87136 || >=10.4.0 || >=10.5.0 || >=9.11.08.0.0-20250218121836-2b5275d87136
Identifiers
GHSA-3g36-gf7c-75qw · CVE-2025-41395 · GO-2025-3642
Weakness (CWE)
CWE-1287
Tags
Published
24 Apr 2025
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Mattermost Playbooks plugin (github.com/mattermost/mattermost-plugin-playbooks) versions before 1.41.0 and 2.0.0 and later are affected, and the Mattermost server (github.com/mattermost/mattermost/server/v8) is affected in several version ranges. An attacker who can create posts can craft a RetrospectivePost post with malicious props, causing a denial of service of the web app for all users. Upgrade the Playbooks plugin to 1.41.0 or the server to 8.0.0-20250218121836-2b5275d87136.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CNA (Mattermost)
  • CISA KEV Not listed.
  • EPSS 0.0050, the 43rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:14 UTC First seen by agentprime
  2. 31 Oct 2026, 14:14 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.