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High severity · published Aug 11, 2025
CVE-2025-54463
Unexpected Input to Cloud Webhook endpoint Causes DoS in Mattermost Confluence Plugin
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to server webhook endpoint with an invalid request body.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
Mattermost Confluence Plugin · Mattermost
before 1.5.0 · source: vendor
CO
Confluence · Mattermost
before 1.5.0 · source: NVD
Affected product
MC
Mattermost Confluence Plugin
Mattermost
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-54463
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-54463
Vendor Advisory
https://mattermost.com/security-updates
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