VDB
CVE-2026-2458
CVE-2026-2458
PUBLISHED
CVSS 5.300000190734863 MEDIUM
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the size of responses from integration action endpoints, which allows an authenticated attacker to cause server memory exhaustion and denial of service via a malicious integration server that returns an arbitrarily large response when a user clicks an interactive message button.. Mattermost Advisory ID: MMSA-2026-00571
EPSS 0.04% · 12.3th percentile
Risk Scores
CVSS 3.1
5.300000190734863
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS Score
0.04%
12.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.3.0, 11.2.0, 10.11.0 |
Exploit Intelligence
- MMSA-2026-00571 (circl)
- CIRCL seen: CVE-2026-2456 (circl-sighting)
- GO-2026-4729.yaml (github-poc)
- GO-2026-4729.yaml (github-poc)
- GO-2026-4729.yaml (github-poc)
- GO-2026-4729.yaml (github-poc)
- GO-2026-4729.yaml (github-poc)
- GO-2026-4729.yaml (github-poc)
Timeline
- Feb 16, 2026 CVE Published
- Feb 16, 2026 PoC Published
- Mar 16, 2026 EPSS Score
- Mar 17, 2026 EPSS Score
- Mar 18, 2026 EPSS Score
- Mar 18, 2026 Security Advisory
- Mar 18, 2026 CVE Updated
- Mar 19, 2026 EPSS Score
- Mar 20, 2026 EPSS Score
- Mar 21, 2026 EPSS Score
- Mar 22, 2026 EPSS Score
- Mar 22, 2026 Coalition ESS Score
References
- https://mattermost.com/security-updates/ advisory
- MMSA-2026-00571 vendor-advisory