Concrete CMS 9.0.0 through 9.5.3 is vulnerable to stored XSS via the custom page alias name (customAliasName) because the Edit Alias dialog applied only trim() to the submitted value and performed no input neutralization. An authenticated user holding canWrite (editor) permission on a page could store a malicious alias name that was later rendered unescaped in the administrative Sitemap panel, where it executed automatically in any administrator or editor session that opened the panel, allowing an editor to escalate to administrator through the victim's active session. 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:L/SC:N/SI:N/SA:N. Thanks Nguyen Manh Thuan for reporting.
Metrics
Affected Vendors & Products
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History
Tue, 29 Sep 2026 19:30:00 +0000
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| CPEs | cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
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Tue, 15 Sep 2026 20:30:00 +0000
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| Metrics |
ssvc
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Mon, 14 Sep 2026 23:30:00 +0000
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| First Time appeared |
Concretecms
Concretecms concrete Cms |
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| Vendors & Products |
Concretecms
Concretecms concrete Cms |
Mon, 14 Sep 2026 21:30:00 +0000
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| Description | Concrete CMS 9.0.0 through 9.5.3 is vulnerable to stored XSS via the custom page alias name (customAliasName) because the Edit Alias dialog applied only trim() to the submitted value and performed no input neutralization. An authenticated user holding canWrite (editor) permission on a page could store a malicious alias name that was later rendered unescaped in the administrative Sitemap panel, where it executed automatically in any administrator or editor session that opened the panel, allowing an editor to escalate to administrator through the victim's active session. 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:L/SC:N/SI:N/SA:N. Thanks Nguyen Manh Thuan for reporting. | |
| Title | Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Stored XSS in Custom Page Alias Name | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: ConcreteCMS
Published: 2026-09-14T21:27:57.200Z
Updated: 2026-09-15T19:15:09.790Z
Reserved: 2026-07-28T18:02:01.020Z
Link: CVE-2026-18117
Updated: 2026-09-15T19:15:02.493Z
Status : Analyzed
Published: 2026-09-14T22:16:57.483
Modified: 2026-09-29T19:17:27.670
Link: CVE-2026-18117
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