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Mozilla Firefox CVE-2026-16374

| EUVDEUVD-2026-46210 HIGH
Information Exposure (CWE-200)
2026-07-21 mozilla GHSA-gqm4-gr2q-ph9g
Information Disclosure Red Hat Mozilla
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
5.3 MEDIUM

Information disclosure yields C:H with no integrity/availability impact; the DevTools scope realistically requires content/user interaction, so UI:R and AC:H rather than the input's UI:N/AC:L.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 17:07 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
7.5 (HIGH)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
HIGH 7.5

DescriptionCVE.org

Information disclosure in the Framework component in DevTools. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

AnalysisAI

Information disclosure in the Firefox DevTools Framework component allows an attacker to read data that should remain isolated, affecting Mozilla Firefox prior to 153 and Firefox ESR prior to 140.13. Reported by Mozilla and carrying a CVSS 7.5 (high) rating driven by high confidentiality impact, there is no public exploit identified at time of analysis and the EPSS probability is low at 0.15% (5th percentile). The issue is fixed and not listed in CISA KEV.

Technical ContextAI

The flaw resides in the DevTools Framework, the internal tooling layer that powers Firefox's developer inspector, debugger, and console panels. CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) is the root-cause class, indicating that the framework surfaces data across a trust boundary it should not - typically content, cross-origin data, or internal browser state that the DevTools context can reach. Because DevTools operates with elevated visibility into page and browser internals, a leakage bug here can expose information that ordinary web content is normally isolated from. The affected product is identified in CPE data as cpe:2.3:a:mozilla:firefox, i.e. the desktop Firefox application rather than a server-side product.

RemediationAI

Vendor-released patch: Firefox 153 and Firefox ESR 140.13 - upgrade to at least these versions on the mainline and ESR channels respectively. Standard-channel users should update to Firefox 153 or later, while organizations pinned to the extended support release should move to ESR 140.13 or later. Consult Mozilla advisories MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/) and MFSA2026-70 (https://www.mozilla.org/security/advisories/mfsa2026-70/) for the definitive fixed-version mapping. No specific vendor workaround is published; as an interim compensating control on unpatched endpoints, restrict or disable developer tools via enterprise policy (the DisableDeveloperTools policy) to shrink the affected attack surface, accepting the trade-off that this impairs legitimate web-development workflows. Because Firefox ships built-in auto-update, ensuring automatic updates remain enabled is the lowest-effort durable remediation.

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Same weakness CWE-200 – Information Exposure

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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CVE-2026-16374 vulnerability details – vuln.today
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