All vulnerabilities
CVE-2026-117864

Firefox: Sandbox escape in the Form Manager component

Mozilla FirefoxApplications & CMS
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published27 Oct 2026Updated 27 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

Sandbox escape in the Form Manager component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Text from CVE List

Affected versions 4

  • Firefoxunaffected: 153.6 through 153.*CVE List
  • Firefoxunaffected: 159CVE List
  • Thunderbirdunaffected: 153.6 through 153.*CVE List
  • Thunderbirdunaffected: 159CVE List

References 5