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CVE-2026-81894

Concrete CMS · cross-site scripting

CVSS 4.0 8.5 HIGHCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-81894

Published

Concrete CMS 9.5.2 and below is vulnerable to stored DOM-based Cross-site Scripting (XSS) via the Gallery block's per-image Caption field because the bundled Magnific Popup lightbox script (concrete/js/features/imagery/frontend.js) re-parses the attribute-decoded caption as HTML through jQuery's .append() in titleSrc instead of inserting it as text. A user with permission to edit a page containing a Gallery block can store a caption that executes in the browser of any visitor who opens that image's lightbox. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 8.5 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.

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Affected versions, risk and source history

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23 Oct 2026 15:48:27 UTC

Concrete CMS 9.5.2 and below is vulnerable to Stored DOM-based Cross-site Scripting (XSS) in the Gallery block image Caption field

cve-program · CVE-2026-81894 · Published

ChangeIntel

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Sources read 13 Nov 13:11 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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