EUVD-2026-60663
GHSA-c224-pmx6-qhpm
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered browser exploit requiring only user interaction; no auth needed; full CIA impact within unchanged Firefox privilege scope per CWE-269.
Primary rating from Vendor (mozilla).
CVSS VectorVendor: mozilla
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Privilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
Articles & Coverage 1
AnalysisAI
Privilege escalation via the Shell Integration component in Mozilla Firefox allows a remote unauthenticated attacker - with user interaction - to achieve full compromise of confidentiality, integrity, and availability on affected systems. Affected are all Firefox releases prior to 154 and ESR branches prior to 140.14 and 153.1, as confirmed by Mozilla advisories mfsa2026-74, mfsa2026-76, and mfsa2026-77. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to interact with attacker-controlled web content in a vulnerable version of Firefox - specifically, user interaction is confirmed required (UI:R per CVSS), such as visiting a crafted page, clicking a link, or opening a specially constructed resource that exercises the Shell Integration component. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) signals a high-severity, low-complexity, unauthenticated flaw with full CIA triad impact, requiring only user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious web page or resource that, when rendered by a vulnerable Firefox browser, triggers a code path in the Shell Integration component that improperly elevates the execution context. The victim visits the attacker-controlled page (providing the required user interaction), after which the browser invokes a shell-level operation without sufficient privilege validation, granting the attacker elevated access on the host. … |
| Remediation | Vendor-released patch: Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Firefox deployments across the organization and identify systems running affected versions (Firefox pre-154, ESR pre-140.14/153.1). …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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