EUVD-2026-12383
GHSA-34g8-9fpp-46ch
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Description
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
Analysis
Mattermost fails to enforce response size limits on integration action endpoints, allowing an authenticated attacker to trigger server memory exhaustion and denial of service by clicking an interactive message button that connects to a malicious integration server returning arbitrarily large responses. This vulnerability affects Mattermost versions 11.3.0, 11.2.x up to 11.2.2, and 10.11.x up to 10.11.10. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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