5.3

CVE-2025-8285: mattermost confluence Missing Authorization

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-qjrx-j8wm-xf83GO-2025-3868
Published 11-08-2025Last modified 11-08-2025
Open JSON

Vulnerability summary

CVE-2025-8285 is a medium (CVSS 5.3) Missing Authorization vulnerability in mattermost confluence. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 8.8% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.20%
0%100%
Low · 0.00 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-2025:15469-1OPENSUSE-SU-2026:21483-1

Timeline

  1. 11-08-2025
    PublishedVulnerability first disclosed.
  2. 11-08-2025
    Last modifiedVulnerability information updated.

Description

Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.20%

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< 1.5.0

2 vendors · 3 products

References

5 links