Information disclosure via channel mentions in posts
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 8.0.0-20251209134645-761e56bb11cc, 5.3.2-0.20251209134645-761e56bb11cc
- 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
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Mattermost Mattermost
From 11.1.0 · through 11.1.2; From 10.11.0 · through 10.11.9; From 11.2.0 · through 11.2.1
- github.com/mattermost/mattermost-serverGo
All versions
- github.com/mattermost/mattermost-serverGo
From 10.11.0+incompatible
- github.com/mattermost/mattermost-serverGo
From 11.1.0+incompatible
- github.com/mattermost/mattermost-serverGo
From 11.2.0+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20251209134645-761e56bb11cc
- github.com/mattermost/mattermost-serverGo
From 11.1.0
- github.com/mattermost/mattermost-serverGo
From 10.11.0
- github.com/mattermost/mattermost-serverGo
From 11.2.0
- github.com/mattermost/mattermost-serverGo
fixed in 5.3.2-0.20251209134645-761e56bb11cc