7.7

CVE-2025-13523: mattermost confluence Cross-site Scripting

CVSS: 7.7v3.1HighAnalyzed
AliasesGHSA-ffx7-34p2-vm3wGO-2026-4456
Published 06-02-2026Last modified 06-02-2026
Open JSON

Vulnerability summary

CVE-2025-13523 is a high (CVSS 7.7) Cross-site Scripting vulnerability in mattermost confluence. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.7/10
010
High · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0757-1

Timeline

  1. 06-02-2026
    PublishedVulnerability first disclosed.
  2. 06-02-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

+0.02 pp

From 0.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mattermost2 products
Github.com/mattermost1 product
  • mattermost-plugin-confluence< 1.7.0

2 vendors · 3 products

References

4 links