CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 10.11.17+incompatible, 11.5.5+incompatible, 11.6.1+incompatible, 8.0.0-20260423180926-c021eeaff8f0, 11.6.1, and 2 more
- 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: total
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Mattermost Mattermost
From 11.6.0 · through 11.6.1; From 11.5.0 · through 11.5.4; From 10.11.0 · through 10.11.15; From 10.11.0 · through 10.11.16
- github.com/mattermost/mattermost-serverGo
From 10.11.0+incompatible · fixed in 10.11.17+incompatible; From 11.5.0+incompatible · fixed in 11.5.5+incompatible; From 11.6.0+incompatible · fixed in 11.6.1+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions
- github.com/mattermost/mattermost/server/v8Go
From 8.0.0-20250731163400-5b955468ea1e · fixed in 8.0.0-20260423180926-c021eeaff8f0
- github.com/mattermost/mattermost-serverGo
From 11.6.0 · fixed in 11.6.1
- github.com/mattermost/mattermost-serverGo
From 11.5.0 · fixed in 11.5.5
- github.com/mattermost/mattermost-serverGo
From 10.11.0 · fixed in 10.11.17