CVE-2026-11025: 
vulnerability analysis and mitigation

CVE-2026-11025 is a Content Security Policy (CSP) bypass vulnerability caused by insufficient policy enforcement in the Navigation component of Google Chrome on Android. It affects all Chrome for Android versions prior to 149.0.7827.53 and allows a remote, unauthenticated attacker to bypass CSP protections via a crafted HTML page, requiring only user interaction (e.g., visiting a malicious site). The vulnerability was reported internally by Google on 2026-03-30 and patched with the Chrome 149 stable channel release on June 2, 2026. It carries a CVSS v3.1 base score of 6.5 (Medium) (Chrome Releases, Feedly).

The root cause is classified as CWE-602 (Client-Side Enforcement of Server-Side Security), where Chrome's Navigation subsystem on Android fails to adequately enforce Content Security Policy directives during certain navigation events. This allows a remote attacker to craft a malicious HTML page that triggers a navigation flow in which CSP restrictions are not properly applied, enabling the loading of restricted resources or execution of scripts that should have been blocked. The vulnerability is network-delivered and requires user interaction — specifically, a victim visiting or being redirected to an attacker-controlled page. The Chromium issue tracker entry is #497595264, though full technical details remain restricted pending broad user update (Chrome Releases).

Successful exploitation allows an attacker to bypass Content Security Policy protections on affected Android devices running Chrome, enabling the loading of unauthorized scripts or restricted external resources that CSP is designed to block. The primary impact is on integrity (CVSS integrity impact: High), as an attacker could inject or execute unintended scripts within the context of a web page, potentially facilitating cross-site scripting attacks, data theft, or further exploitation of web application logic. Confidentiality and availability are not directly impacted by this vulnerability alone, but CSP bypass can serve as a stepping stone for more severe attacks (Feedly).

1. Reconnaissance: Identify Android users running Google Chrome versions prior to 149.0.7827.53, which can be inferred from user-agent strings or targeted phishing campaigns.
2. Craft malicious HTML page: Develop a web page that exploits the Navigation CSP bypass by triggering a specific navigation event (e.g., using redirects, iframes, or navigation API calls) that causes Chrome on Android to fail to enforce the page's CSP directives.
3. Deliver the payload: Host the crafted HTML page on an attacker-controlled server and lure the victim to visit it via phishing, malvertising, or a malicious link — user interaction is required.
4. Bypass CSP: When the victim navigates to the page, Chrome's Navigation component fails to enforce CSP, allowing the attacker's page to load restricted external scripts or resources (e.g., from a third-party attacker-controlled domain) that would otherwise be blocked.
5. Execute unintended scripts: The loaded scripts execute in the context of the victim's browser session, potentially enabling data exfiltration, session hijacking, or further exploitation of web application vulnerabilities (Chrome Releases, Feedly).

• Network: Outbound HTTP/HTTPS requests from an Android Chrome browser to unexpected third-party domains immediately following navigation to an unfamiliar page; requests to domains not listed in the site's Content-Security-Policy header.
• Logs: Web server access logs showing requests to pages with unusual navigation patterns (e.g., rapid redirects, iframe-based navigation chains); CSP violation reports (if report-uri is configured) that are absent despite policy-violating resource loads.
• Browser Behavior: Scripts or resources loading from origins not permitted by the page's declared CSP without triggering CSP violation reports; unexpected JavaScript execution on pages with strict CSP policies when accessed from Android Chrome prior to version 149.0.7827.53.

Update Google Chrome on Android to version 149.0.7827.53 or later, which contains the fix for this vulnerability. Enterprise administrators should ensure Chrome is updated via managed device policies (e.g., Google Mobile Management or MDM solutions). As a temporary measure, organizations can monitor for CSP violations using the report-uri or report-to CSP directives to detect potential bypass attempts. No configuration-based workaround is available that fully mitigates the vulnerability without patching (Chrome Releases).

The vulnerability was part of a large Chrome 149 security release that addressed 429 security fixes, drawing general attention from the security community. Security tracking platforms including Tenable (Nessus plugins 319634 and 320419) and Qualys (detection ID 387565) added detection coverage shortly after disclosure. Coverage was noted in security news outlets including security-next.com and pro-linux.de, as well as community discussion on Mastodon (infosec.exchange). No significant individual researcher commentary or vendor statements beyond the standard Google Chrome release advisory have been identified for this specific CVE (Chrome Releases).