How severe is CVE-2025-54463?

CVE-2025-54463 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-54463 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54463?

CVE-2025-54463 affects Mattermost Confluence. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54463?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-54463 have an EU (EUVD) identifier?

Yes. CVE-2025-54463 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24172.

When was CVE-2025-54463 published?

CVE-2025-54463 was published on 2025-08-11 and last updated on 2026-06-17.

CVE-2025-54463

CVE-2025-54463 is a medium-severity vulnerability in Mattermost Confluence with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-754.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24172
Weakness: CWE-754
Affected product: Mattermost Confluence
Published: 2025-08-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-54463?: 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 severe is CVE-2025-54463?: CVE-2025-54463 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-54463 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54463?: CVE-2025-54463 affects Mattermost Confluence. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54463?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-54463 have an EU (EUVD) identifier?: Yes. CVE-2025-54463 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24172.
When was CVE-2025-54463 published?: CVE-2025-54463 was published on 2025-08-11 and last updated on 2026-06-17.

References

https://mattermost.com/security-updates

Affected products (1)

cpe:2.3:a:mattermost:confluence:*:*:*:*:*:*:*:*

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