Security incident · CVE-2025-13523
Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malic
Published Feb 6, 2026 · catalog updated Feb 6, 2026 · Mattermost Mattermost Confluence Plugin
Last checked Nov 4, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-13523. EPSS is 0.22%. Act only if a listed version of Mattermost Mattermost Confluence Plugin is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2025-8285 · Medium
- CVE-2025-54525 · High
- CVE-2025-54478 · High
- CVE-2025-54463 · Medium
- CVE-2025-54458 · Medium
- Severity
- High7.7
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.22%
- Remediation
- Version ranges on file
- Affected products
- vendor Mattermost Mattermost Confluence Plugin 0 <1.7.0
Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malicious display names to execute arbitrary JavaScript in victim browsers via sending a specially crafted OAuth2 connection link that, when visited, renders the attacker's display name without proper sanitization. Mattermost Advisory ID: MMSA-2025-00557
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Mattermost Mattermost Confluence Plugin 0 <1.7.00 <1.7.0
How to fix CVE-2025-13523
Upgrade
CVE-2025-13523 lists a fix boundary at 1.7.0. Compare the installed build with that boundary before you change production.
Version check
Seen in 0 <1.7.0
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-13523. EPSS is 0.22%. Act only if a listed version of Mattermost Mattermost Confluence Plugin is installed.
Which versions are affected?
Compare what you have installed with Mattermost Mattermost Confluence Plugin 0 <1.7.0 0 <1.7.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.22%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 6, 2026 · EUVD
Detected
Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malicious display names to execute arbitrary JavaScript in victim browsers via sending a specially crafted OAuth2 connection link that, when visited, renders the attacker's display name without proper sanitization. Mattermost
Feb 6, 2026 · EUVD
Updated
Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malicious display names to execute arbitrary JavaScript in victim browsers via sending a specially crafted OAuth2 connection link that, when visited, renders the attacker's display name without proper sanitization. Mattermost
Sources
- CVE.orgVulnerability recordCVE-2025-13523
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-13523
30-day exploitation probability 0.22%
first.org - EUVDVulnerability recordEUVD-2025-206888
Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malicious display names to execute arbitrary JavaScript in victim browsers via sending a specially crafte
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 4, 2026
- CVE.orgNov 4, 2026
- EUVDNov 3, 2026