How severe is CVE-2025-53857?

CVE-2025-53857 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-53857 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-53857?

CVE-2025-53857 affects Mattermost Confluence. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-53857?

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

Does CVE-2025-53857 have an EU (EUVD) identifier?

Yes. CVE-2025-53857 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24175.

When was CVE-2025-53857 published?

CVE-2025-53857 was published on 2025-08-11 and last updated on 2026-06-17.

CVE-2025-53857

CVE-2025-53857 is a low-severity vulnerability in Mattermost Confluence with a CVSS 3.x base score of 3.7. 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-862.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24175
Weakness: CWE-862
Affected product: Mattermost Confluence
Published: 2025-08-11
Last modified: 2026-06-17

Description

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to get channel subscription details without proper access to the channel via API call to the GET autocomplete/GetChannelSubscriptions endpoint.

Frequently asked questions

What is CVE-2025-53857?: Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to get channel subscription details without proper access to the channel via API call to the GET autocomplete/GetChannelSubscriptions endpoint.
How severe is CVE-2025-53857?: CVE-2025-53857 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-53857 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-53857?: CVE-2025-53857 affects Mattermost Confluence. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-53857?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-53857 have an EU (EUVD) identifier?: Yes. CVE-2025-53857 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24175.
When was CVE-2025-53857 published?: CVE-2025-53857 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:*:*:*:*:*:mattermost:*:*

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