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Advisory record · GHSA-9hh7-6558-qfp2

Mattermost allows other users to determine when users had read channels via channel member objects in github.com/mattermost/mattermost-server

CVSS 3.0 LowEPSS 0.0018 · 7th percentile

Published by the GitHub Advisory Database at 25 Nov 2025, 18:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/mattermost/mattermost-serverGo>=10.5.0+incompatible, <10.5.12+incompatible || >=10.11.0+incompatible, <10.11.4+incompatible10.5.12+incompatible, 10.11.4+incompatible
github.com/mattermost/mattermost-server/v5Goall versionsNo fixed version yet
github.com/mattermost/mattermost-server/v6Goall versionsNo fixed version yet
github.com/mattermost/mattermost/server/v8Goall versionsNo fixed version yet
Identifiers
GHSA-9hh7-6558-qfp2 · CVE-2025-55074 · GO-2025-4133
Weakness (CWE)
CWE-1426
Tags
Published
25 Nov 2025
Updated
3 Mar 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
3.0 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N CNA (Mattermost)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 7th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 25 Nov 2025. New records show when each source confirmed them.

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.