PT-2025-34259 · Mattermost · Mattermost

Daw10 · Published 2025-08-21 · Updated 2025-08-29 · CVE-2025-8402

Positive Technologies (AI Summary)

CVSS v3.1

4.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Mattermost versions 10.8.x through 10.8.3 Mattermost versions 10.5.x through 10.5.8 Mattermost versions 9.11.x through 9.11.17 Mattermost versions 10.10.x through 10.10.0 Mattermost versions 10.9.x through 10.9.3

Description: Mattermost fails to validate import data, potentially allowing a system administrator to crash the server via the bulk import feature.

Recommendations: Mattermost versions 10.8.x through 10.8.3: Update to a version later than 10.8.3. Mattermost versions 10.5.x through 10.5.8: Update to a version later than 10.5.8. Mattermost versions 9.11.x through 9.11.17: Update to a version later than 9.11.17. Mattermost versions 10.10.x through 10.10.0: Update to a version later than 10.10.0. Mattermost versions 10.9.x through 10.9.3: Update to a version later than 10.9.3.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-1287

CWE-476

Related Identifiers

CVE-2025-8402

GHSA-H469-4FCF-P23H

GO-2025-3911

Affected Products

Mattermost

References · 12

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-h469-4fcf-p23h · Vendor Advisory
• https://osv.dev/vulnerability/GO-2025-3911 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-8402 · Security Note
• https://osv.dev/vulnerability/CVE-2025-8402 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://t.me/CVEtracker/30610 · Telegram Post
• https://twitter.com/CVEnew/status/1958603381318328829 · Twitter Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-8402 · Note
• https://github.com/advisories/GHSA-h469-4fcf-p23h · Note
• https://pkg.go.dev/vuln/GO-2025-3911 · Note
• https://twitter.com/VulmonFeeds/status/1958599050720162102 · Twitter Post