# CVE-2026-121174

Chrome BackgroundFetch origin-policy bypass (pre-157.0.8103.38)

- Page: https://www.vulneraibility.com/cve/CVE-2026-121174
- CVSS: 8.8
- Known exploited: not in CISA KEV as of our last sync
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-04)
- Weakness: CWE-862
- Published: 2026-11-03

## Affected versions

- Google Chrome: affected < 157.0.8103.38

A version outside these ranges is not a statement that it is unaffected.

## Impact

Bypass same-origin policy via crafted HTML using BackgroundFetch, enabling unauthorized cross-origin data access or actions.

## Action

Patch when possible

## Recommendation

Update Chrome to 157.0.8103.38 or later immediately

## References

- [other] https://chromereleases.googleblog.com/2026/11/stable-channel-update-for-desktop.html
- [other] https://issues.chromium.org/issues/496008447

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.