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CVE-2025-54525

Unexpected input to Create Channel Subscription endpoint causes DoS in Mattermost Confluence Plugin

HIGH
7.5
CVSS Score
Published: August 11, 2025 at 06:57 PM UTC
Updated: June 17, 2026 at 09:40 AM UTC
2 products affected across 1 vendorConfluenceConfluence Plugin

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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 create channel subscription endpoint with an invalid request body.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Confluence· Mattermost
95%
v < 1.5.0
Confluence Plugin· Mattermost
60%
v < 1.5.0
Vendor states this is fixed in 1.5.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHMattermost
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1287

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