CVE-2019-5864 — Insufficient data validation in CORS in Google Chrome prior to 76

Insufficient data validation in CORS in Google Chrome prior to 76.0.3809.87 allowed an attacker who convinced a user to install a malicious extension to bypass content security policy via a crafted Chrome Extension.

01What is this vulnerability?

Insufficient data validation in CORS in Google Chrome prior to 76.0.3809.87 allowed an attacker who convinced a user to install a malicious extension to bypass content security policy via a crafted Chrome Extension.

02Affected products

Vendor	Product	Versions
Google	Chrome	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-11-25T14:22:56.000Z
• Last modified: 2024-08-04T20:09:23.839Z

09References

• chromereleases.googleblog.com — https://chromereleases.googleblog.com/2019/07/stable-channel-update-for-desktop_…
• crbug.com — https://crbug.com/936900