PatchTheCVECVE-2025-53514: Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to
CVE-2025-53514 is a medium-severity flaw (CVSS 5.9) affecting confluence. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 79%) |
| CISA exploited list | No |
| Weakness | CWE-754 |
| Published | 2025-08-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-53514?
confluence: upgrade to 1.5.0. Exact commands for each OS are on this page.
Is CVE-2025-53514 being exploited?
CVE-2025-53514 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-53514 affect?
CVE-2025-53514 affects confluence. Severity is medium (CVSS 5.9). 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.
How urgent is CVE-2025-53514?
Priority 31/100. Remotely exploitable, no login, no user action
Software pages
Atlassian Confluence vulnerabilities · Mattermost vulnerabilities
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