PT-2025-34201 · Mattermost · Mattermost

Daw10 · Published 2025-08-21 · Updated 2025-08-29 · CVE-2025-49222

Positive Technologies (AI Summary)

CVSS v3.1

6.8

Medium

Base vector

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

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 10.9.x through 10.9.2 Mattermost versions 10.10.x through 10.10.0

Description: The Mattermost application fails to validate upload types in remote cluster upload sessions. This allows a system administrator to upload non-attachment file types via shared channels, potentially placing them in arbitrary filesystem directories.

Recommendations: Mattermost versions 10.8.x through 10.8.3: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Mattermost versions 10.5.x through 10.5.8: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Mattermost versions 9.11.x through 9.11.17: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Mattermost versions 10.9.x through 10.9.2: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Mattermost versions 10.10.x through 10.10.0: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2025-49222

GHSA-Q453-638C-H4MR

GO-2025-3904

Affected Products

Mattermost

References · 12

• https://osv.dev/vulnerability/GO-2025-3904 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-49222 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-49222 · Security Note
• https://osv.dev/vulnerability/GHSA-q453-638c-h4mr · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://mattermost.com/security-updates · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-49222 · Note
• https://twitter.com/VulmonFeeds/status/1958476167767290003 · Twitter Post
• https://t.me/CVEtracker/30569 · Telegram Post
• https://twitter.com/CVEnew/status/1958453720984764553 · Twitter Post
• https://github.com/advisories/GHSA-q453-638c-h4mr · Note
• https://pkg.go.dev/vuln/GO-2025-3904 · Note