One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 10.5.10+incompatible, 10.9.5+incompatible, 10.10.2+incompatible, 8.0.0-20250731063404-9eebaadf8f72, 10.10.2, 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 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.
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; From 10.5.0 · through 10.5.9; From 10.9.0 · through 10.9.4
- github.com/mattermost/mattermost-serverGo
From 10.5.0+incompatible · fixed in 10.5.10+incompatible; From 10.9.0+incompatible · fixed in 10.9.5+incompatible; 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
fixed in 8.0.0-20250731063404-9eebaadf8f72
- github.com/mattermost/mattermost-serverGo
From 10.10.0 · fixed in 10.10.2
- github.com/mattermost/mattermost-serverGo
From 10.5.0 · fixed in 10.5.10
- github.com/mattermost/mattermost-serverGo
From 10.9.0 · fixed in 10.9.5