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TI-2026-03508 Aliases CVE-2026-4053GHSA-hw87-6jcq-9f8q

post edit time limit is not enforced on some post update operations

Priority LOW 19CWE-672Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints.. Mattermost Advisory ID: MMSA-2026-00631

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00165 5th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 11.6.0, 11.5.2, 10.11.14github.com/mattermost/mattermost-server (Go): 11.5.2, 0.0.0-20260414103857-b21ef302025e

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MattermostMattermost11.5.0 – 11.5.1; 10.11.0 – 10.11.1311.6.0, 11.5.2, 10.11.14Patch availableCNA
—github.com/mattermost/mattermost-server (Go)11.5.0 to before 11.5.211.5.2Patch availableGHSA-hw87-6jcq-9f8q
—github.com/mattermost/mattermost-server (Go)0.0.0-20250731163400-5b955468ea1e to before 0.0.0-20260414103857-b21ef302025e0.0.0-20260414103857-b21ef302025ePatch availableGHSA-hw87-6jcq-9f8q
  • Mattermost VendorMattermost Affected 11.5.0 – 11.5.1; 10.11.0 – 10.11.13 Fixed in 11.6.0, 11.5.2, 10.11.14 Patch available CNA
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 11.5.0 to before 11.5.2 Fixed in 11.5.2 Patch available GHSA-hw87-6jcq-9f8q
  • github.com/mattermost/mattermost-server (Go) Vendor— Affected 0.0.0-20250731163400-5b955468ea1e to before 0.0.0-20260414103857-b21ef302025e Fixed in 0.0.0-20260414103857-b21ef302025e Patch available GHSA-hw87-6jcq-9f8q

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*10.11.0 to before 10.11.14; 11.5.0 to before 11.5.2VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 10.11.0 to before 10.11.14; 11.5.0 to before 11.5.2 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 11.6.0, 11.5.2, 10.11.14
  • Fix · GHSA-hw87-6jcq-9f8q github.com/mattermost/mattermost-server (Go) Fixed in 11.5.2 Advisory →
  • Fix · GHSA-hw87-6jcq-9f8q github.com/mattermost/mattermost-server (Go) Fixed in 0.0.0-20260414103857-b21ef302025e Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4053
  2. 2026-10-03 Alias added: GHSA-hw87-6jcq-9f8q

References

Advisory 2

Other 1

  • TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
  • TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
  • TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
  • TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
  • TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
  • TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
See all 505 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences