Slash command trigger-word update allowed command hijacking
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 11.5.2, 10.11.14, 11.4.4, 8.0.0-20260306123948-f5fe8ded6b63, 5.3.2-0.20260306123948-f5fe8ded6b63, and 3 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: partial
Summary
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Mattermost Mattermost
From 11.5.0 · through 11.5.1; From 10.11.0 · through 10.11.13; From 11.4.0 · through 11.4.3
- github.com/mattermost/mattermost/server/v8Go
From 11.5.0 · fixed in 11.5.2
- github.com/mattermost/mattermost/server/v8Go
From 10.11.0 · fixed in 10.11.14
- github.com/mattermost/mattermost/server/v8Go
From 11.4.0 · fixed in 11.4.4
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20260306123948-f5fe8ded6b63
- github.com/mattermost/mattermost-serverGo
fixed in 5.3.2-0.20260306123948-f5fe8ded6b63
- github.com/mattermost/mattermost-serverGo
From 10.11.0+incompatible · fixed in 10.11.14+incompatible; From 11.4.0+incompatible · fixed in 11.4.4+incompatible; From 11.5.0+incompatible · fixed in 11.5.2+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions