Editor-to-Administrator escalation via unsanitized alias name
Published Sep 14, 2026 · Updated Sep 14, 2026
Stored XSS in custom page alias names in Concrete CMS 9.0.0 through 9.5.2 allows remote authenticated users to execute script. The alias update path stored customAliasName after only trimming it, and the administrative Sitemap panel later rendered the value without HTML neutralization. Page-level canWrite permission is required; execution occurs when an administrator or editor opens the panel and can expose the victim's active session.
Summary
What happened
Stored XSS in custom page alias names in Concrete CMS 9.0.0 through 9.5.2 allows remote authenticated users to execute script. The alias update path stored customAliasName after only trimming it, and the administrative Sitemap panel later rendered the value without HTML neutralization. Page-level canWrite permission is required; execution occurs when an administrator or editor opens the panel and can expose the victim's active session.
The record
- CVE
- CVE-2026-18117
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=9.0.0 <=9.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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