CVE-2026-5903

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{"bugzilla": {"description": "chromium-browser: Policy bypass in IFrameSandbox", "id": "2456749", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456749"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-838", "details": ["A policy bypass flaw was found in the IFrameSandbox component of the Chromium browser.\nUpstream bug(s):\nhttps://code.google.com/p/chromium/issues/detail?id=483771899"], "name": "CVE-2026-5903", "public_date": "2026-04-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-5903\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-5903\nhttps://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html\nhttps://issues.chromium.org/issues/483771899"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,147.0.7727.55)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Chrome", "source": "cna", "vendor": "Google"}, "product": "chrome", "vendor": "google"}], "analysis": {"en": {"generated_at": "2026-04-13T22:40:44.796113+00:00", "value": {"mitigation_remediation": ["Update Google Chrome to version 147.0.7727.55 or later.", "Enable automatic updates so that future patches are applied promptly.", "Exercise caution when interacting with unfamiliar web pages that may prompt IFrame-related UI gestures."], "summary": {"action": "Update Browser", "impact": "Policy Bypass (Navigation Restrictions)"}, "threat_synthesis": {"affected_systems": "Google Chrome versions prior to 147.0.7727.55 running on Windows, macOS, and Linux operating systems are affected. Users of the Chrome Desktop browser on any of these platforms are susceptible to the policy bypass until the specified update is installed.", "description_and_impact": "An attacker can craft a malicious HTML page that, by inducing a user to perform specific UI gestures, bypasses the IFrameSandbox policy in Google Chrome versions before 147.0.7727.55. This policy bypass removes navigation restrictions, allowing the attacker to load content from arbitrary URLs or execute scripts that would normally be blocked. Because the weakness involves browser policy enforcement, it aligns with CWE\u2011693 (Noncompliance with Specified Security Policy) and CWE\u2011838 (Exploiting IFrameSandbox). The described impact can facilitate phishing, data exfiltration, or other malicious actions within the context of the affected browser session.", "risk_and_exploitability": "The CVSS score of 6.5 indicates a moderate severity, while the EPSS score of less than 1% shows a low likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires user interaction; the attacker must persuade the victim to engage in specific UI gestures within the browser. Although the attack path is limited to social engineering, the potential for bypassing navigation controls raises concern, especially for users visiting untrusted sites."}}}}, "created": "2026-04-09T08:16:49.561368+00:00", "updated": "2026-04-14T16:37:26.137636+00:00", "vendors": ["google", "google$PRODUCT$chrome"]}