7.5

CVE-2025-35965: DoS in Mattermost Playbooks via Excessive Task Actions

Analyzed
AliasesGHSA-689c-xq7x-xjwfGO-2025-3643CGA-cj7j-rmg5-94gc
Published 24-04-2025Last modified 24-04-2025

Vulnerability summary

CVE-2025-35965 is a high (CVSS 7.5) vulnerability in mattermost. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.40%
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 1 · Related 5
OPENSUSE-SU-2025:15033-1CGA-2RX5-6WQ7-888GCGA-C6FP-CPPM-P54VCGA-JJ79-RW2C-WRGRCGA-X279-CPR5-WCQC

Timeline

  1. 24-04-2025
    PublishedVulnerability first disclosed.
  2. 24-04-2025
    Last modifiedVulnerability information updated.

Description

Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to validate the uniqueness and quantity of task actions within the UpdateRunTaskActions GraphQL operation, which allows an attacker to create task items containing an excessive number of actions triggered by specific posts, overloading the server and leading to a denial-of-service (DoS) condition.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.40% 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.

Chainguard2 products
  • mattermost-fips-10.5< 10.5.3-r3
  • mattermost-fips-10.5-compat< 10.5.3-r3
Github.com/mattermost2 products
  • mattermost-plugin-playbooks≥ 2.0.0 (No fix recorded) | All versions (No fix recorded) | < 1.41.0
  • mattermost-server≥ 9.11.0+incompatible (No fix recorded) | ≥ 10.4.0+incompatible (No fix recorded) | ≥ 10.5.0+incompatible (No fix recorded)
Github.com/mattermost/mattermost-server2 products
  • v5All versions (No fix recorded)
  • v6All versions (No fix recorded)
Mattermost2 products
  • mattermost≥ 10.4.0, ≤ 10.4.2 | 10.5.0 | ≥ 9.11.0, ≤ 9.11.10
  • mattermost_serverEOL≥ 9.11.0, < 9.11.11 | ≥ 10.4.0, < 10.4.3 | 10.5.0
Github.com/mattermost/mattermost/server1 product
  • v8≥ 10.4.0 (No fix recorded) | ≥ 10.5.0 (No fix recorded) | ≥ 9.11.0 (No fix recorded) | All versions (No fix recorded) | < 8.0.0-20250218121836-2b5275d87136

5 vendors · 9 products

References

7 links