CVE-2026-3495

Unescaped variables during error page composition

CVSS 3.8 LOWEPSS 0.1%CWE-79

Vexday Risk Score

8Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 3.8EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Ciclo de vida

18 may 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Productos afectados

Mattermost · Mattermost

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Referencias

https://mattermost.com/security-updates