High severity · published Oct 16, 2025
CVE-2025-58075
Arbitrary Mattermost Team can be joined by manipulating the SAML RelayState
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the RelayState
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
10.11.0 through 10.11.1; 10.10.0 through 10.10.2; 10.5.0 through 10.5.10 · source: vendor
MS
Mattermost Server · Mattermost
10.5.0 before 10.5.11; 10.10.0 before 10.10.3; 10.11.0 before 10.11.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-58075
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-58075
Vendor Advisory
https://mattermost.com/security-updates
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