CVE-2025-9076GO-2025-3950GHSA-3VCM-C42P-3HHF
Mattermost Server exposes sensitive user credentials during shared channel membership synchronization
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 10.10.2+incompatible, 8.0.0-20250729073403-517ae758cd02, 10.10.2
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Mattermost Mattermost
From 10.10.0 · through 10.10.1
- github.com/mattermost/mattermost-serverGo
From 10.10.0+incompatible · fixed in 10.10.2+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions
- github.com/mattermost/mattermost/server/v8Go
All versions
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20250729073403-517ae758cd02
- github.com/mattermost/mattermost-serverGo
From 10.10.0 · fixed in 10.10.2