EUVD-2026-76245
GHSA-jwgj-v3j4-f3wg
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable, no privileges required, but user must click crafted link and authenticate; redirect itself has low integrity impact only.
Primary rating from Vendor (ConcreteCMS).
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
1DescriptionCVE.org
Concrete CMS versions 9.5.0 through 9.5.2 are vulnerable to Open Redirect via the rcURL parameter. An attacker can craft a single link on the site's own domain that sends a user to an arbitrary external site immediately after authentication, facilitating phishing and credential theft. The same handling is present in the registration flow, giving a second entry point on sites with registration enabled. Concrete CMS versions prior to 9.5.0 do not include the rcURL parameter or this allowlist and are not affected. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Michal M. for reporting.
AnalysisAI
Open redirect in Concrete CMS 9.5.0-9.5.2 allows an unauthenticated attacker to craft a legitimate-looking URL on the victim site that silently forwards an authenticated user to an arbitrary external domain immediately after login or registration. The vulnerability targets the newly introduced rcURL parameter in the authentication and registration flows, making it uniquely scoped to the 9.5.x minor release line. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target site is running Concrete CMS version 9.5.0, 9.5.1, or 9.5.2 - versions outside this range are not vulnerable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 5.3 (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N) accurately reflects the moderate severity of this class of vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Concrete CMS version 9.5.3, which resolves the allowlist bypass in the `rcURL` parameter handling per the 9.5.3 release notes (https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes). … Detailed patch versions, workarounds, and compensating controls in full report. |
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