Medium severity · published Jan 15, 2025
CVE-2025-20088
Insufficient Input Validation on Post Props
6.5
CVSS
0.6%
EPSS
No
On KEV
Description
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Mattermost · Mattermost
10.2.0; 9.11.0 through 9.11.5; 10.0.0 through 10.0.3; 10.1.0 through 10.1.3 · source: vendor
MS
Mattermost Server · Mattermost
9.11.0 before 9.11.6; 10.0.0 before 10.0.4; 10.1.0 before 10.1.4; 10.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-20088
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-20088
Vendor Advisory
https://mattermost.com/security-updates
More from Mattermost
9.9
CVE-2026-4858
Path traversal in integration action URL leading to arbitrary API execution via system admin’s auth token.
9.9
CVE-2025-12421
Account Takeover via Code Exchange Endpoint
9.9
CVE-2025-12419
Account takeover on OAuth/OpenID-enabled servers
9.9
CVE-2025-4981
Path Traversal Leading to RCE by Any Authenticated Mattermost User
9.8
CVE-2023-6458
Client side path traversal due to lack of route parameters validation