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TI-2022-00807 Aliases CVE-2022-0903GHSA-8wqp-c6pq-684g

Stack overflow in SAML login in Mattermost

Priority MEDIUM 40CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

A call stack overflow bug in the SAML login feature in Mattermost server in versions up to and including 6.3.2 allows an attacker to crash the server via submitting a maliciously crafted POST body.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00828 57th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 6.3.3, 6.2.3, 6.1.3 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
MattermostMattermost6.3 to before 6.3.3; 6.2 to before 6.2.3; 6.1 to before 6.1.3; 5.37 to before 5.37.86.3.3, 6.2.3, 6.1.3, 5.37.8Patch availableCNA
  • Mattermost VendorMattermost Affected 6.3 to before 6.3.3; 6.2 to before 6.2.3; 6.1 to before 6.1.3; 5.37 to before 5.37.8 Fixed in 6.3.3, 6.2.3, 6.1.3, 5.37.8 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*before 5.37.8; 6.0.0 to before 6.1.3; 6.2.0 to before 6.2.3; 6.3.0 to before 6.3.3VulnerableMattermost
  • cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions before 5.37.8; 6.0.0 to before 6.1.3; 6.2.0 to before 6.2.3; 6.3.0 to before 6.3.3 Vulnerable ·Mattermost

Remediation

  • Fix · CNA Mattermost (Mattermost) Fixed in 6.3.3, 6.2.3, 6.1.3, 5.37.8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mattermost 5.37.8, 6.1.3 and 2 more versions

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2022-00808 Stack overflow in document extractor in MattermostPriority LOW 31
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-0903
  2. 2026-10-03 Alias added: GHSA-8wqp-c6pq-684g

References

Advisory 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