GitHub Advisoryadvisory · Go

GHSA-3rhr-jr63-hwq5 Mattermost fails to preserve the redacted state of burn-on-read posts during deletion

MEDIUM Published 2026-03-16 Modified 2026-03-17 Official page ↗
Aliases
CVE-2026-2578
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-201
Reviewed
2026-03-17

Affected packages

• Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20260127062706-c6b205f0d770 → fixed in 8.0.0-20260127062706-c6b205f0d770 • Go github.com/mattermost/mattermost-server: < 5.3.2-0.20260127062706-c6b205f0d770 → fixed in 5.3.2-0.20260127062706-c6b205f0d770 • Go github.com/mattermost/mattermost-server: >= 10.11.0-rc1, < 10.11.11 → fixed in 10.11.11 • Go github.com/mattermost/mattermost-server: >= 11.2.0-rc1, < 11.2.3 → fixed in 11.2.3 • Go github.com/mattermost/mattermost-server: >= 11.3.0-rc1, < 11.3.1 → fixed in 11.3.1

Description

Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event. Mattermost Advisory ID: MMSA-2026-00579

Related

Alias · CVE (1)

  • CVE-2026-2578 Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members… vulnerability

Weakness · CWE (1)

  • CWE-201 Insertion of Sensitive Information Into Sent Data weakness

References