Firefox patches multiple unspecified security vulnerabilities
Multiple unspecified vulnerabilities in Firefox versions before 151.0.3 require immediate patching per Mozilla security advisory mfsa2026-54.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 2 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The French CERT (ANSSI) has issued an advisory regarding multiple security vulnerabilities discovered in Mozilla Firefox versions prior to 151.0.3. The nature of these vulnerabilities has not been specified by the vendor at this time, though they are significant enough to warrant a formal security bulletin and patching guidance.
Two CVE identifiers have been assigned to track these issues: CVE-2026-10701 and CVE-2026-10702. Mozilla has released Firefox version 151.0.3 to address these vulnerabilities. The lack of technical detail in the advisory suggests either ongoing coordinated disclosure or that the vendor is withholding specifics to limit exploitation window.
Organizations running affected Firefox versions should prioritize updating to version 151.0.3 or later according to Mozilla security advisory mfsa2026-54 published on June 2, 2026. Given the vendor's decision to issue a security update without full disclosure, treating these vulnerabilities as potentially serious is prudent until more information becomes available.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0684
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