Vulnerability · CVE-2025-53514
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 i
Published Aug 11, 2025 · catalog updated Aug 11, 2025 · Mattermost Mattermost Confluence Plugin
Last checked Oct 23, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-53514. EPSS is 0.29%. Act only if a listed version of Mattermost Mattermost Confluence Plugin is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2025-8285 · Medium
- CVE-2025-54525 · High
- CVE-2025-54478 · High
- CVE-2025-54463 · Medium
- CVE-2025-54458 · Medium
- Severity
- Medium5.9
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.29%
- Remediation
- Version ranges on file
- Affected products
- vendor Mattermost Mattermost Confluence Plugin 0 <1.5.0
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Mattermost Mattermost Confluence Plugin 0 <1.5.00 <1.5.0
How to fix CVE-2025-53514
Upgrade
CVE-2025-53514 lists a fix boundary at 1.5.0. Compare the installed build with that boundary before you change production.
Version check
Seen in 0 <1.5.0
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-53514. EPSS is 0.29%. Act only if a listed version of Mattermost Mattermost Confluence Plugin is installed.
Which versions are affected?
Compare what you have installed with Mattermost Mattermost Confluence Plugin 0 <1.5.0 0 <1.5.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Aug 11, 2025 · EUVD
Detected
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.
Aug 11, 2025 · EUVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2025-53514
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-53514
30-day exploitation probability 0.29%
first.org - EUVDVulnerability recordEUVD-2025-24176
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.
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSOct 23, 2026
- CVE.orgOct 21, 2026
- EUVDOct 20, 2026