Chrome is ubiquitous; a site‑isolation bypass can expose cross‑origin data across enterprise endpoints and requires org‑wide remediation.
CVE-2026-87471
Chrome ServiceWorker auth bug allows site‑isolation bypass
Is CVE-2026-87471 being exploited?
Not confirmed. CVE-2026-87471 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-87471?
CVE-2026-87471 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-87471?
Yes. A fix has been recorded for CVE-2026-87471. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-87471 affect?
CVE-2026-87471 affects Google Chrome < 153.0.8010.36, Chrome Desktop (Windows/macOS/Linux). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-87471?
Update Chrome to 153.0.8010.36 or later immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Site‑isolation bypass enabling cross‑origin data access after a compromised renderer process (data theft from other sites/tabs).
Immediate action required
- affected< 153.0.8010.36
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.