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CVE-2026-12322 Mozilla CVE debrief

A clickjacking issue was found in the Widget: Gtk component. This vulnerability was fixed in Firefox 152. The issue was reported to Mozilla via Bugzilla and addressed in the Mozilla Firefox Security Advisory (MFSA) 2026-57.

Vendor
Mozilla
Product
Firefox
CVSS
MEDIUM 5.4
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 Mozilla Firefox, particularly those using versions prior to Firefox 152, should be aware of this vulnerability and take steps to update their browsers.

Technical summary

The CVE-2026-12322 vulnerability is a clickjacking issue in the Widget: Gtk component of Mozilla Firefox. This issue allows an attacker to deceive users into clicking on something different than what they intended, potentially leading to unauthorized actions.

Defensive priority

Medium

Recommended defensive actions

  • Update Mozilla Firefox to version 152 or later to ensure the clickjacking issue in the Widget: Gtk component is fixed.

Evidence notes

The CVE-2026-12322 vulnerability was reported to Mozilla and addressed in Firefox 152. References to the Bugzilla report and Mozilla Firefox Security Advisory (MFSA) 2026-57 can be found below.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12322 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12322

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

  • CVE-2026-12322 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12322

    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.