4.1

CVE-2025-64641: Mattermost Jira plugin crafted action leaks Jira issue details

Analyzed
AliasesGHSA-vww6-79rv-3j4xGO-2025-4260
Published 24-12-2025Last modified 24-12-2025

Vulnerability summary

CVE-2025-64641 is a medium (CVSS 4.1) Incorrect Authorization vulnerability in mattermost. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware 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. 24-12-2025
    PublishedVulnerability first disclosed.
  2. 24-12-2025
    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 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.

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/mattermost1 product
  • 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 | ≥ 11.1.0+incompatible, < 11.1.1+incompatible
Github.com/mattermost/mattermost/server1 product
  • v8< 8.0.0-20251121122154-b57c297c6d7 | All versions (No fix recorded)

4 vendors · 6 products

References

7 links