CVE-2026-2760
Sandbox escape via WebRender in Firefox/Thunderbird.
Is CVE-2026-2760 being exploited?
Not confirmed. CVE-2026-2760 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 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2026-2760?
CVE-2026-2760 is rated Critical with a CVSS score of 10.0. 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-2026-2760?
Yes. A fix has been recorded for CVE-2026-2760. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-2760 affect?
CVE-2026-2760 affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-2760?
Update to the latest Firefox/Thunderbird builds.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Sandbox escape via WebRender could lead to host code execution via crafted content in affected Firefox/Thunderbird.
Immediate action required