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Wed, 16 Sep 2026 18:30:00 +0000
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ssvc
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Wed, 16 Sep 2026 00:00:00 +0000
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Concretecms
Concretecms concrete Cms |
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| Vendors & Products |
Concretecms
Concretecms concrete Cms |
Tue, 15 Sep 2026 20:30:00 +0000
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| Description | Concrete CMS before 9.5.3 contained a stored cross-site scripting vulnerability in SVG file handling. When SVG processing was set to the non-default "Reject files containing potentially harmful elements" mode (concrete.file_manager.images.svg_sanitization.action = reject), uploaded SVGs were checked only against a small built-in blocklist covering the script element and on* event-handler attributes; the broader enshrined/svg-sanitize pass still ran, but its result was discarded, so vectors it would have stripped, such as a javascript: URI in an xlink:href, were stored unmodified and executed when the file was opened directly. A user able to upload files could thereby run arbitrary JavaScript in the browser of any user who viewed the file. The default sanitize mode was not affected. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 1.8 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Oriol Ortiz for reporting. | |
| Title | Concrete CMS before 9.5.3 is vulnerable to Stored XSS via SVG upload in "Reject" sanitization mode | |
| Weaknesses | CWE-79 | |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: ConcreteCMS
Published:
Updated: 2026-09-16T17:52:45.158Z
Reserved: 2026-08-27T18:25:43.099Z
Link: CVE-2026-81927
Updated: 2026-09-16T17:52:36.319Z
Status : Awaiting Analysis
Published: 2026-09-15T21:16:43.220
Modified: 2026-09-16T19:16:15.097
Link: CVE-2026-81927
No data.
OpenCVE Enrichment
Updated: 2026-09-15T23:45:17Z
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CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')