Wide-use of Google Chrome; high-severity origin-policy bypass (CVSS 8.8) can expose cross-origin data and sessions across enterprise users—requires org-wide remediation.
CVE-2026-121171
Chrome DevTools origin-policy bypass enables cross-origin data theft.
Is CVE-2026-121171 being exploited?
Not confirmed. CVE-2026-121171 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 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-121171?
CVE-2026-121171 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-2026-121171?
Yes. A fix has been recorded for CVE-2026-121171. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-121171 affect?
CVE-2026-121171 affects Google Chrome <157.0.8103.38 (desktop). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-121171?
Update Chrome to 157.0.8103.38 or later immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted page can bypass same-origin policy to read cross-origin data and hijack sessions via DevTools confused-deputy.
Immediate action required
- affected< 157.0.8103.38
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.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 4 Nov 2026 (SSVC 2.0.3).
timeline
- 3 Nov 2026Published
- 4 Nov 2026CISA SSVC assessment: exploitation none · 1 day later
- 4 Nov 2026CVE record last updated · same day later
- 5 Nov 2026Analysed by vulneraibility.com · 1 day later
- Linkchromereleases.googleblog.com /2026/11/stable-channel-update-for-desktop.html
- Linkissues.chromium.org /issues/562238690
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.