Mitigation bypass in the File Handling component
Mozilla · Firefox
A mitigation bypass in the File Handling component of Mozilla Firefox defeats a protection mechanism that the browser uses to guard file handling. An attacker with network access can exploit it without authentication or user interaction, to compromise confidentiality, integrity and availability.
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158.
- Exploited
- Not confirmed
- Reports
- 0
- Tactics
- 0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
Disclosed on 6 Oct 2026. No public exploit code or confirmed exploitation is recorded.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linkedNo ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
What security researchers reported
Not named in any threat report yetAlso mentioned in 9 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Known_Cve | Oct 15, 2026 | Part 1/314 Oct 2026
- Known_Cve | Oct 14, 2026 | Part 1/313 Oct 2026
- Known_Cve | Oct 13, 2026 | Part 1/212 Oct 2026
- Known_Cve | Oct 12, 2026 | Part 1/211 Oct 2026
- Known_Cve | Oct 11, 2026 | Part 1/210 Oct 2026
- Known_Cve | Oct 10, 2026 | Part 1/29 Oct 2026
- 3 more on OTX