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Advisory record · GHSA-rmvv-8v8w-rf7x

Mattermost doesn't validate user-supplied input in API request handlers

CVSS 4.3 MediumEPSS 0.0025 · 16th percentile

Published by the GitHub Advisory Database at 26 May 2026, 13:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/mattermost/mattermost-serverGo>=11.6.0, <11.6.1 || >=11.5.0, <11.5.4 || >=11.4.0, <11.4.5 || >=10.11.0, <10.11.1511.6.1, 11.5.4, 11.4.5, 10.11.15
github.com/mattermost/mattermost-plugin-githubGo<1.0.1-0.20260330164815-c2840e980b3c1.0.1-0.20260330164815-c2840e980b3c
Identifiers
GHSA-rmvv-8v8w-rf7x · CVE-2026-4646 · GO-2026-5833
Weakness (CWE)
CWE-1287
Tags
Published
26 May 2026
Updated
7 Jul 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 0.0025, the 16th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:06 UTC First seen by agentprime
  2. 31 Oct 2026, 15:06 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.