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CVE-2026-6339

MEDIUM · CVSS 4.3 EPSS 0.11%

Source: NVD + CISA KEV + EPSS · Published: 2026-05-18 · Last synced: 2026-06-17

CyberRota Analysis

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CVE
CVE-2026-6339
Severity
MEDIUM
CVSS
4.3
EPSS
0.11%

Original NVD Description

Mattermost versions 11.5.x <= 11.5.1, 11.4.x <= 11.4.3 fail to validate the X-Requested-With header on the burn-on-read reveal endpoint which allows an authenticated channel member to force the reveal of a burn-on-read message without recipient consent via a crafted Markdown image tag.. Mattermost Advisory ID: MMSA-2026-00636