# CVE-2026-87544: Google Chrome incorrect authorization in Extensions

Source: https://junglewise.ai/threats/cve-2026-87544-google-chrome-incorrect-authorization-in-extensions  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-09. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-87544 · Severity: critical · CVSS 9.8 · Published 2026-09-09

Google Chrome's extension system contained an authorization flaw that allowed attackers to bypass security restrictions and access privileged pages. A user visiting a crafted malicious webpage could allow an attacker to gain unauthorized access to sensitive browser functionality normally restricted to trusted extensions, potentially exposing sensitive user data or allowing further system compromise.

Technologies: [Google Chrome](https://junglewise.ai/threats/technologies/chrome). Vendors: [Google](https://junglewise.ai/threats/vendors/google).

## Quick answers

**Is CVE-2026-87544 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-87544 being exploited in the wild.

**How severe is CVE-2026-87544?** Critical severity, with a CVSS score of 9.8, published 9 September 2026.

**Which products and versions are affected?** Google Chrome prior to 153.0.8010.36.

**Is there a fix for CVE-2026-87544?** A patch was published on 2026-09-08. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-87544 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-87544?** Check whether you run Google Chrome at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is an incorrect authorization flaw in Google Chrome's Extensions subsystem (CWE-863). The root cause involves insufficient validation of access controls when extensions or web pages attempt to access privileged functionality. An unauthenticated remote attacker can craft a malicious HTML page that, when visited by a user, bypasses system access restrictions and gains unauthorized access to privileged pages normally protected from web content. The attack requires user interaction (visiting the malicious page) and network reachability. Google patched this issue in Chrome 153.0.8010.36 and later versions. Chromium assessed this as low severity, though the reported CVSS score is significantly higher.

## Affected products

- Google Chrome prior to 153.0.8010.36

## Timeline

- 2026-09-09: disclosed
- 2026-09-08: patched

## References

- [https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html](https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html)
- [https://issues.chromium.org/issues/542355360](https://issues.chromium.org/issues/542355360)

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