PT-2026-41348 · Mattermost · Mattermost

Se1En · Published 2026-05-15 · Updated 2026-05-15 · CVE-2026-4053

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.5.0 through 11.5.1 Mattermost versions 10.11.0 through 10.11.13

Description An issue exists where the system fails to enforce the PostEditTimeLimit on non-message post fields. This allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired by using the post patch and update API endpoints.

Recommendations Update Mattermost versions 11.5.0 through 11.5.1 to a version newer than 11.5.1. Update Mattermost versions 10.11.0 through 10.11.13 to a version newer than 10.11.13.

Fix

Weakness Enumeration

CWE-672

Related Identifiers

CVE-2026-4053

GHSA-HW87-6JCQ-9F8Q

Affected Products

Mattermost

References · 5

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-hw87-6jcq-9f8q · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4053 · Security Note
• https://github.com/mattermost/mattermost · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-4053 · Note