4.3

CVE-2026-22892: Insufficient Authorization in Mattermost Jira Plugin Allows Unauthorized Access to Post Attachments

Analyzed
AliasesGHSA-9pj7-jh2r-87g8GO-2026-4496
Published 13-02-2026Last modified 13-02-2026

Vulnerability summary

CVE-2026-22892 is a medium (CVSS 4.3) Incorrect Authorization vulnerability in mattermost. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · +0.01 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. 13-02-2026
    PublishedVulnerability first disclosed.
  2. 13-02-2026
    Last modifiedVulnerability information updated.

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to validate user permissions when creating Jira issues from Mattermost posts, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to via the /create-issue API endpoint by providing the post ID of an inaccessible post.. Mattermost Advisory ID: MMSA-2025-00550

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.25% 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, no user interaction (CVSS vector). Other conditions: not stated in public data.

Mattermost2 products
  • mattermost≥ 11.1.0, ≤ 11.1.2 | ≥ 10.11.0, ≤ 10.11.9 | ≥ 11.2.0, ≤ 11.2.1
  • mattermost_server≥ 10.11.0, < 10.11.10 | ≥ 11.0.0, < 11.1.3 | ≥ 11.2.0, < 11.2.2
Github.com/mattermost1 product
  • mattermost-server≥ 11.2.0, < 11.2.2 | ≥ 11.1.0, < 11.1.3 | ≥ 10.11.0, < 10.11.10 | ≥ 11.2.0+incompatible, < 11.2.2+incompatible

2 vendors · 3 products

References

4 links