EUVD-2026-79940

| CVE-2026-81926 LOW

Cross-site Scripting (XSS) (CWE-79)

2026-09-15 ff5b8ace-8b95-4078-9743-eac1ca5451de

GHSA-994m-pc89-jhp9

XSS

2.0

CVSS 4.0 · Vendor: ff5b8ace-8b95-4078-9743-eac1ca5451de

Severity by source

Vendor (ff5b8ace-8b95-4078-9743-eac1ca5451de) PRIMARY

2.0 LOW

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/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

Primary rating from Vendor (ff5b8ace-8b95-4078-9743-eac1ca5451de) · only source for this CVE.

CVSS VectorVendor: ff5b8ace-8b95-4078-9743-eac1ca5451de

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Sep 15, 2026 - 22:01 vuln.today

DescriptionCVE.org

Concrete CMS 9.4.0 through 9.5.2 did not escape colliding page paths before rendering them in the location panel's duplicate-path confirmation dialog. The panel's check endpoint returned the submitted path unmodified in its JSON response, and client-side JavaScript inserted each value into the dialog as raw HTML, so a crafted page path executed script in the editor's authenticated browser session. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.

AnalysisAI

Concrete CMS versions 9.4.0 through 9.5.2 fail to escape page paths before rendering them inside the location panel's duplicate-path confirmation dialog: the panel's check endpoint reflects the submitted path unmodified in its JSON response, and client-side JavaScript injects that value as raw HTML, so a crafted path executes script in an authenticated editor's browser session. An attacker must already hold page-authoring privileges and must engineer a path collision so the confirmation dialog appears, and the victim must then open that panel; no public exploit code or CISA KEV entry is associated with this CVE at time of analysis.