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Advisory record · GHSA-2549-xh72-qrpm

Mattermost Improper Validation of Specified Type of Input vulnerability

CVSS 4.3 MediumEPSS 0.0061 · 49th percentile

Published by the GitHub Advisory Database at 9 Jan 2025, 09:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/mattermost/mattermost/server/v8Go>=9.11.0, <9.11.16 || >=10.0.0, <10.0.4 || >=10.1.0, <10.1.4 || >=10.2.0, <10.2.1 || <8.0.0-20250102081831-64c566a8280b9.11.16, 10.0.4, 10.1.4, 10.2.1, 8.0.0-20250102081831-64c566a8280b
Identifiers
GHSA-2549-xh72-qrpm · CVE-2025-20033 · GO-2025-3379
Weakness (CWE)
CWE-1287
Tags
Published
9 Jan 2025
Updated
10 Sept 2026

Machine-written summary

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

Mattermost server (Go module github.com/mattermost/mattermost/server/v8) versions before 8.0.0-20250102081831-64c566a8280b, 9.11.x through 9.11.15, 10.0.x before 10.0.4, 10.1.x before 10.1.4, and 10.2.0 are affected. An attacker who can create posts can send a post with a specific custom type and properties, which fails to be validated and can deny service to users who hold the sysconsole_read_plugins permission. Upgrade to 8.0.0-20250102081831-64c566a8280b, 9.11.16, 10.0.4, 10.1.4, or 10.2.1, depending on your release line.

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
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CNA (Mattermost)
  • CISA KEV Not listed.
  • EPSS 0.0061, the 49th 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.