CVE-2025-9072One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
Updated under an hour ago ()
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It affects Mattermost and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 7.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
- Weakness (CWE)
- CWE-601
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Mattermost
- NVD analysis
- Analyzed
- Record last updated
- Sep 15, 2025
- First seen by InfoSec Signals
- Oct 19, 2026
Affected products
Mattermost Mattermost mattermost:mattermost (from the name) | from 10.10.0 through 10.10.1; from 10.5.0 through 10.5.9; from 10.9.0 through 10.9.4; 10.11.0 not affected; 10.10.2 not affected; 10.5.10 not affected; 10.9.5 not affected | CNA record |
mattermost mattermost_server mattermost:mattermost_server | from 10.5.0 before 10.5.10; from 10.9.0 before 10.9.5; from 10.10.0 before 10.10.2 | NVD |
References
- https://mattermost.com/security-updatesvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.