CVE-2026-5891

<!-- Proof of Concept: Simulating the effect of UI Spoofing --> <!-- Note: Real exploitation requires compromising the renderer process first --> <div style="position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(255, 255, 255, 0.9); z-index: 9999; display: flex; justify-content: center; align-items: center;"> <div style="width: 400px; background: #fff; border: 1px solid #dadce0; border-radius: 8px; box-shadow: 0 4px 16px rgba(0,0,0,0.2); font-family: 'Segoe UI', Arial, sans-serif;"> <div style="padding: 20px; border-bottom: 1px solid #dadce0;"> <h3 style="margin: 0; color: #202124; font-size: 18px;">Update Chrome</h3> </div> <div style="padding: 20px; color: #5f6368; font-size: 14px;"> Security update required. Please update to continue browsing safely. </div> <div style="padding: 16px; display: flex; justify-content: flex-end;"> <button style="background: #1a73e8; color: white; border: none; padding: 8px 24px; border-radius: 4px; cursor: pointer; font-weight: bold;">Update Now</button> </div> </div> </div>

{"cve": {"id": "CVE-2026-5891", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:28.990", "lastModified": "2026-04-14T11:44:52.557", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient policy enforcement in browser UI in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a crafted HTML page. (Chromium security severity: Medium)"}], "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:N/A:L", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-451"}]}], "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/487471101", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}]}}