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CVE-2026-12320 Mozilla CVE debrief

CVE-2026-12320 is an information disclosure vulnerability in the Password Manager component of Firefox. The vulnerability was published and modified on June 16, 2026, at 13:16:32.710Z. The vendor is currently listed as Unknown Vendor, but evidence suggests the vulnerability may be related to Mozilla. The vulnerability was fixed in Firefox 152. For more information, see [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-12320) and [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-12320).

Vendor
Mozilla
Product
Firefox
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Users of Firefox, particularly those using versions prior to Firefox 152, should be aware of this vulnerability and take steps to update their browsers.

Technical summary

This vulnerability allows for information disclosure in the Password Manager component of Firefox. It was fixed in Firefox 152.

Defensive priority

High

Recommended defensive actions

  • Update Firefox to version 152 or later.
  • Review [ref-4](https://bugzilla.mozilla.org/show_bug.cgi?id=2027572) and [ref-5](https://www.mozilla.org/security/advisories/mfsa2026-57/) for additional information.

Evidence notes

The vendor is currently listed as Unknown Vendor, but evidence suggests the vulnerability may be related to Mozilla.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12320 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12320

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12320 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12320

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.