CVE-2026-3495

Unescaped variables during error page composition

State: Published
Severity: 3.8 Low
Published: May 18, 2026
Updated: May 18, 2026
Reserved: Mar 3, 2026

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622

Scores

CVSS	Score	Vector	Source
3.1	3.8 Low	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N	Mattermost

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
MattermostMattermost	11.5.0 through 11.5.1Affected 10.11.0 through 10.11.13Affected 11.6.0Not affected 11.5.2Not affected 10.11.14Not affected

References

MMSA-2026-00622vendor-advisory

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