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CVE-2026-18111
8.5 HIGH
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CVSS version (CVSS): 4.0
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Attack Vector (AV): Network (N)
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Attack Complexity (AC): Low (L)
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Attack Requirement (AT): None (N)
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Privileges Required (PR): High (H)
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User Interaction (UI): Passive (P)
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Vulnerable System Impact Confidentiality (VC): High (H)
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Vulnerable System Impact Integrity (VI): High (H)
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Vulnerable System Impact Availability (VA): High (H)
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Subsequent System Impact Confidentiality (SC): None (N)
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Subsequent System Impact Integrity (SI): None (N)
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Subsequent System Impact Availability (SA): None (N)
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Modified Attack Vector (MAV): Network (N)
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Modified Attack Complexity (MAC): Low (L)
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Modified Attack Requirement (MAT): None (N)
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Modified Privileges Required (MPR): High (H)
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Modified User Interaction (MUI): Passive (P)
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Modified Vulnerable System Impact Confidentiality (MVC): High (H)
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Modified Vulnerable System Impact Integrity (MVI): High (H)
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Modified Vulnerable System Impact Availability (MVA): High (H)
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Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
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Modified Subsequent System Impact Integrity (MSI): Negligible (N)
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Modified Subsequent System Impact Availability (MSA): Negligible (N)
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Safety (S): Not Defined (X)
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Automatable (AU): Not Defined (X)
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Recovery (R): Not Defined (X)
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Value Density (V): Not Defined (X)
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Vulnerability Response Effort (RE): Not Defined (X)
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Provider Urgency (U): Not Defined (X)
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Confidentiality Req. (CR): Not Defined (X)
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Integrity Req. (IR): Not Defined (X)
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Availability Req. (AR): Not Defined (X)
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Exploit Maturity (E): Not Defined (X)
created
1 week, 3 days ago
Activity log
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Created & dismissed (no matching packages found) suggestion
1 week, 3 days ago
Concrete CMS below 9.5.4 allows privilege escalation because adding users and assigning groups do not require additional identity verification
Concrete CMS 9 before 9.5.3 was vulnerable to stored cross-site scripting (XSS) in the Feature, Feature Link, Hero Image, and Image blocks and before Concrete 8.5.21 in the feature and Image blocks because the external link URL was insufficiently validated by the link filter and was rendered without output escaping. A user with page-editing permissions (such as Add Block combined with Edit Contents on a single page) could store a crafted external link value that broke out of the link markup and injected arbitrary JavaScript. The script executed in the browser session of any user who subsequently viewed, previewed, or edited the affected page, which could lead to session hijacking and escalation of privileges up to full administrative takeover. The Concrete CMS security team gave this vulnerability a CVSS v4.0 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 to KhanMarshai for reporting this issue.