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Advisory record · GHSA-xp9j-8p68-9q93

Mattermost Server Improper Access Control

CVSS 3.1 LowEPSS 0.0031 · 24th percentile

Published by the GitHub Advisory Database at 5 Apr 2024, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/mattermost/mattermost/server/v8Go<8.1.118.1.11
Identifiers
GHSA-xp9j-8p68-9q93 · BIT-mattermost-2024-21848 · CVE-2024-21848 · GO-2024-2707
Weakness (CWE)
CWE-273 · CWE-284
Tags
Published
5 Apr 2024
Updated
10 Sept 2026

Machine-written summary

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

Mattermost Server (github.com/mattermost/mattermost/server/v8) versions before 8.1.11 are vulnerable to improper access control. A user who is in a channel with an active call can remain in that call after being removed from the channel. Upgrade to version 8.1.11 or later.

Written 2 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
3.1 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N CNA (Mattermost)
  • CISA KEV Not listed.
  • EPSS 0.0031, the 24th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:15 UTC First seen by agentprime
  2. 31 Oct 2026, 14:15 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.