Low severity · published Aug 11, 2025
CVE-2025-53857
Lack of Authorization on Get Channel Subscriptions for Autocomplete in Mattermost Confluence Plugin
3.7
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% 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
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-53857
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-53857
Vendor Advisory
https://mattermost.com/security-updates
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