8.3

CVE-2025-14273: mattermost

CVSS: 8.3v3.1HighAnalyzed
AliasesGHSA-qvmc-92vg-6r35GO-2026-4275
Published 22-12-2025Last modified 22-12-2025
Open JSON

Vulnerability summary

CVE-2025-14273 is a high (CVSS 8.3) vulnerability in mattermost. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.1% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v3.1 (NVD)
EPSS score
0.26%
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-2026:21483-1SUSE-SU-2026:0142-1

Timeline

  1. 22-12-2025
    PublishedVulnerability first disclosed.
  2. 22-12-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 with the Jira plugin enabled and Mattermost Jira plugin versions <=4.4.0 fail to enforce authentication and issue-key path restrictions in the Jira plugin, which allows an unauthenticated attacker who knows a valid user ID to issue authenticated GET and POST requests to the Jira server via crafted plugin payloads that spoof the user ID and inject arbitrary issue key paths. Mattermost Advisory ID: MMSA-2025-00555

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.26%

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

Github.com/mattermost2 products
  • mattermost-plugin-jira< 4.4.1 | All versions (No fix recorded)
  • mattermost-serverAll versions (No fix recorded)
Github.com/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
  • mattermost11.1.0 | ≥ 11.0.0, ≤ 11.0.5 | ≥ 10.12.0, ≤ 10.12.3 | ≥ 10.11.0, ≤ 10.11.7
  • mattermost_server≥ 10.11.0, < 10.11.8 | ≥ 10.12.0, < 10.12.4 | ≥ 11.0.0, < 11.0.6 | ≥ 11.1.0, < 11.1.1
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20251121122154-b57c297c6d7a

4 vendors · 7 products

References

10 links