Medium severity · published Sep 15, 2025
CVE-2025-9072
One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
10.10.0 through 10.10.1; 10.5.0 through 10.5.9; 10.9.0 through 10.9.4 · source: vendor
MS
Mattermost Server · Mattermost
10.5.0 before 10.5.10; 10.9.0 before 10.9.5; 10.10.0 before 10.10.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-9072
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-9072
Vendor Advisory
https://mattermost.com/security-updates
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