4.3

CVE-2026-2461: Missing authorization check allows unauthorized modification of other users' comments on a board

Analyzed
AliasesGHSA-hf8w-x9h5-5gf9GO-2026-4782
Published 16-03-2026Last modified 16-03-2026

Vulnerability summary

CVE-2026-2461 is a medium (CVSS 4.3) vulnerability in mattermost. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% 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
0.17%
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-2026:1135-1

Timeline

  1. 16-03-2026
    PublishedVulnerability first disclosed.
  2. 16-03-2026
    Last modifiedVulnerability information updated.

Description

Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.16% 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≤ 11.0.3 | ≤ 11.2.2 | ≤ 10.10.11
  • mattermost_server< 10.11.11 | ≥ 11.0.0, ≤ 11.0.3 | ≥ 11.1.0, < 11.2.3 | ≥ 11.3.0, < 11.3.1
Github.com/mattermost1 product
  • mattermost-plugin-boards< 0.0.0-20260108044135-57c5be5b6ef5

2 vendors · 3 products

References

5 links