Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Concrete CMS | Concrete CMS | unaffected |
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Tracking
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Mon, 14 Sep 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Concrete CMS before 9.5.3 applied only trim() to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with edit_block permission could inject an event handler that executed script for visitors rendering the page, acting with administrative privileges where the victim was an administrator. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks sh4d0byss for reporting. | |
| Title | Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight) | |
| Weaknesses | CWE-79 | |
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| Metrics |
cvssV4_0
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: ConcreteCMS
Published:
Updated: 2026-09-14T22:07:58.533Z
Reserved: 2026-08-27T18:18:39.738Z
Link: CVE-2026-81900
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')