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CVE-2026-26246 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% · 13.9th percentile

Risk Scores

CVSS v3.1
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%
13.9th percentile

Affected Products

VendorProductVersions
MattermostMattermost11.3.0, 11.2.0, 11.3.1

Timeline

References

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