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Mozilla Firefox CVE-2026-8965

| EUVDEUVD-2026-30913 HIGH
Information Exposure (CWE-200)
2026-05-19 mozilla GHSA-572x-vhpq-w4gm
Information Disclosure Mozilla Suse Red Hat
High
Disputed · 7.5 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
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 VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
May 20, 2026 - 17:25 vuln.today
CVSS changed
May 20, 2026 - 17:22 NVD
7.5 (HIGH)
CVE Published
May 19, 2026 - 12:30 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 151.

AnalysisAI

Information disclosure in Mozilla Firefox prior to version 151 allows remote attackers to leak sensitive data through a flaw in the DOM: Security component, exploitable without authentication or user interaction. The CVSS 7.5 rating reflects high confidentiality impact via network vector, though EPSS scoring at 0.02% (4th percentile) indicates very low predicted exploitation probability and no public exploit identified at time of analysis.

Technical ContextAI

The vulnerability resides in Firefox's DOM: Security component, which enforces web platform security boundaries such as same-origin policy, Content Security Policy, and cross-origin resource isolation within the browser's Document Object Model implementation. The root cause is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), a class of weakness where data intended to be protected by security boundaries becomes accessible to unauthorized contexts. CPE data confirms the affected platform as Mozilla Firefox (cpe:2.3:a:mozilla:firefox), with the fix landing in Firefox 151, suggesting the issue impacts all prior versions of the affected branch.

RemediationAI

Vendor-released patch: upgrade to Mozilla Firefox 151 or later, which contains the fix per Mozilla advisories mfsa2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/) and mfsa2026-50 (https://www.mozilla.org/security/advisories/mfsa2026-50/). Enterprises managing Firefox ESR fleets should consult Mozilla's advisory pages to identify the corresponding ESR backport version before deploying. Pending patch rollout, compensating controls are limited because the flaw is in the rendering engine's security component: restrict browsing to trusted sites via web proxy/URL filtering policies to reduce exposure to attacker-controlled DOM content, and consider enforcing strict Content Security Policy headers on internal applications - note the trade-off that proxy-based controls do not protect against compromised legitimate sites (malvertising, watering hole) and CSP only protects the issuing application, not arbitrary browsing.

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Same weakness CWE-200 – Information Exposure

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CVE-2016-6415 HIGH POC
7.5
CVE-2013-7331 MEDIUM POC
6.5
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9.8
CVE-2017-16894 HIGH POC
7.5
CVE-2017-11165 CRITICAL POC
9.8
CVE-2016-2388 MEDIUM POC
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CVE-2016-1561 HIGH POC
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Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
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CVE-2025-24813 CRITICAL POC
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CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed

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CVE-2026-8965 vulnerability details – vuln.today
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