CVE-2026-117999: Race condition in the IPC component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

PriorityP425

EPSS

0.18%

7.7th percentile

Race condition in the IPC component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
mozilla	firefox	< Firefox 159	Firefox 159
mozilla	firefox_esr	< Firefox ESR 153.6	Firefox ESR 153.6
mozilla	thunderbird	< Thunderbird 153.6	Thunderbird 153.6
mozilla	thunderbird	< Thunderbird 159	Thunderbird 159

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.