PatchTheCVECVE-2026-12456: Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who co
CVE-2026-12456 is a medium-severity flaw (CVSS 4.2) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security severity: High)
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.2 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.1% (top 97%) |
| CISA exploited list | No |
| Weakness | CWE-20 |
| Published | 2026-06-17 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-12456?
chrome: upgrade to 149.0.7827.155. Exact commands for each OS are on this page.
Is CVE-2026-12456 being exploited?
CVE-2026-12456 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-12456 affect?
CVE-2026-12456 affects chrome. Severity is medium (CVSS 4.2). Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security se
How urgent is CVE-2026-12456?
Priority 15/100. No elevated risk signals yet.
Software pages
Google Chrome vulnerabilities · Chromium vulnerabilities
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