Chrome is widely deployed across enterprises; this flaw enables cross-site data access and requires org-wide browser updates.
CVE-2026-87570
Chrome SiteIsolation auth bypass allows cross-site data access after renderer compromise
Is CVE-2026-87570 being exploited?
Not confirmed. CVE-2026-87570 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 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-87570?
CVE-2026-87570 is rated High with a CVSS score of 8.8. 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-2026-87570?
Yes. A fix has been recorded for CVE-2026-87570. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-87570 affect?
CVE-2026-87570 affects Google Chrome <153.0.8010.36 (desktop). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-87570?
Update Chrome to 153.0.8010.36+ and avoid opening untrusted files.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypass Site Isolation to access data from other sites/tabs after compromising the renderer; enables cross-origin data theft.
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.