CVE-2026-87608: Improper certificate validation in Google Chrome
Affects Google ChromeSource GCVE Database
Not known to be exploited · CVSS 7.5 High · fixed in 153.0.8010.36 : patch Google Chrome soon.
Data as of 10/25/2026, 04:40:14 UTC
- Exploitation
Not in CISA KEV, no exploitation reported
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 153.0.8010.36
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NWhat to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Google Chrome | Affected
| Fixed in
|
AI-suggested
A fix is available in Google Chrome version 153.0.8010.36. Users and administrators should update to this version or later to remediate the vulnerability. No additional mitigation steps are indicated in the provided data.
Description
CVE-2026-87608 is a vulnerability in Google Chrome's FedCM component prior to version 153.0.8010.36. It involves improper certificate validation that allows a remote attacker to bypass the web origin policy through crafted network traffic combined with social engineering. The vulnerability has a high severity rating with a CVSS score of 7.5, indicating a significant confidentiality impact without requiring user interaction or privileges.
Impact
An attacker can bypass the web origin policy, potentially exposing sensitive information protected by this security boundary. The confidentiality of user data may be compromised without affecting integrity or availability. This could lead to unauthorized data disclosure in affected versions of Chrome.
Weaknesses
- CWE-295Improper Certificate Validation (opens in a new tab)
Base weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not validate, or incorrectly validates, a certificate.