PatchTheCVECVE-2026-121108: Confused deputy in BackgroundFetch in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potent
CVE-2026-121108 is a high-severity flaw (CVSS 8.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Confused deputy in BackgroundFetch in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 90%) |
| CISA exploited list | No |
| Weakness | CWE-441 |
| Published | 2026-11-03 |
| Last modified | 2026-11-04 |
Last updated 2026-11-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- VulDB Recent Entries: CVE-2026-121108 | Google Chrome up to 156.0.8078.79 BackgroundFetch privileges management 2026-11-03
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-2026-121108?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-121108 being exploited?
CVE-2026-121108 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-2026-121108 affect?
CVE-2026-121108 affects affected software. Severity is high (CVSS 8.8). Confused deputy in BackgroundFetch in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
How urgent is CVE-2026-121108?
Priority 33/100. High severity
Software pages
Google Chrome vulnerabilities · Chromium vulnerabilities