EUVD-2026-36363
GHSA-mmjg-x39c-438q
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:H/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:Amber
Remote crafted page (AV:N/AC:L), no attacker auth (PR:N), victim must visit page (UI:R); origin bypass crosses extension trust boundary into identity backend so S:C with high confidentiality and limited integrity impact.
Primary rating from Vendor (palo_alto).
CVSS VectorVendor: palo_alto
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:H/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:Amber
Lifecycle Timeline
3DescriptionCVE.org
Idira Identity Browser Extension (Chrome, Firefox, and Edge builds) versions prior to 26.8.1 exhibit an origin validation flaw within its internal web-page verification routines. If an authenticated user navigates to a specially crafted webpage, this interaction could potentially allow a remote attacker to trigger unauthorized application interaction or execution parameters within the context of that authenticated browser session. CyberArk Security Bulletin: CA26-21
AnalysisAI
Origin validation failure in CyberArk's Idira Identity Browser Extension for Chrome, Firefox, and Edge (versions prior to 26.8.1) allows a remote attacker to abuse an authenticated user's browser session by luring them to a malicious page. Per CyberArk bulletin CA26-21, the extension's internal web-page verification routine fails to correctly enforce origin checks (CWE-346), enabling unauthorized application interaction in the victim's identity context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Victim must have the Idira Identity Browser Extension installed in Chrome, Firefox, or Edge at a build below 26.8.1 AND must be in an active authenticated session with their CyberArk Identity tenant at the time of the attack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals point to a real, prioritized issue but not an immediate emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker hosts a crafted page (or injects content into a watering-hole site) that issues postMessage or DOM events designed to bypass the extension's origin check. A workforce user already signed into the CyberArk Identity tenant visits the page during normal browsing; the extension processes the attacker-controlled message as if it came from the legitimate Identity origin, granting the attacker the ability to trigger unauthorized identity-application interactions or read sensitive parameters from the authenticated session. … |
| Remediation | Vendor-released patch: upgrade the Idira Identity Browser Extension to version 26.8.1 or later in Chrome, Firefox, and Edge - refer to CyberArk Security Bulletin CA26-21 (accessible via https://docs.cyberark.com/find-identity-administration-docs/latest/en/content/getstarted/identity-new-doc-location.htm) for the per-browser store links. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Alert all Idira extension users of the vulnerability; document current deployment scope and user count. …
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External POC / Exploit Code
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