Chatwoot before 4.14.0 Stored XSS via Help Center Video Embed Links

Advisories

Chatwoot before 4.14.0 Stored XSS via Help Center Video Embed Links

Severity: medium
Date: 10/20/2026
Affecting: chatwoot >= 0, < 4.14.0
CVE: CVE-2026-113355
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 4.8
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
References: https://github.com/chatwoot/chatwoot/pull/14140
https://github.com/chatwoot/chatwoot/commit/2192af80f405c70e3021191ff8b3f7e539c35e9d
chatwoot v4.14.0 Release Notes
https://github.com/chatwoot/chatwoot/blob/88ffa329eb6e18ae06b608d8b4bab96c0e1b8f44/lib/custom_markdown_renderer.rb#L75-L84
Credit: Ostorlab
Description: Chatwoot before 4.14.0 contains a stored cross-site scripting vulnerability that allows account administrators to inject JavaScript by crafting video-embed links in Help Center articles. Attackers can use angle-bracket link destinations with double quotes to break out of the unescaped iframe src attribute in render_embed_from_match, executing scripts for public visitors and stealing cw_conversation widget tokens.

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