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Mozilla Firefox EUVDEUVD-2026-30897

| CVE-2026-8945 HIGH
Protection Mechanism Failure (CWE-693)
2026-05-19 mozilla GHSA-jvw5-v42q-rpwc
Information Disclosure Google Mozilla
7.5
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Network-delivered malicious content (AV:N) needs victim interaction (UI:R) and a hard-to-control sandbox-escape condition (AC:H); no auth (PR:N); escape yields full process compromise (C/I/A:H).

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 17:50 vuln.today
CVE Published
May 19, 2026 - 12:29 nvd
UNKNOWN (no severity yet)
CVE Published
May 19, 2026 - 12:29 cve.org
HIGH 7.5

DescriptionCVE.org

Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

AnalysisAI

Sandbox escape in Mozilla Firefox and Firefox Focus for Android lets a malicious web page break out of the content-process sandbox after luring a victim to attacker-controlled content, gaining full confidentiality, integrity, and availability impact on the affected process. Mozilla addressed it in Firefox 151 (advisory MFSA2026-46); there is no public exploit identified at time of analysis, and EPSS rates near-term exploitation at just 0.05% (16th percentile). CISA SSVC records exploitation status as none with a total technical impact, indicating a serious-but-not-yet-exploited browser flaw.

Technical ContextAI

Firefox runs untrusted web content in isolated content processes that are confined by an OS-level sandbox, preventing renderer-hosted code from directly touching the host system. This issue is classified CWE-693 (Protection Mechanism Failure), meaning the sandbox - the security boundary itself - failed to fully contain the content process, allowing an escape from the restricted renderer into a higher-privileged context. The affected CPE is cpe:2.3:a:mozilla:firefox (all versions prior to 151), and the Android-focused Firefox Focus build shares the same Gecko engine and sandbox model, so both are impacted. The bug was reported by Mozilla and cross-referenced by Red Hat (VEX/CSAF) and VulDB.

RemediationAI

Vendor-released patch: upgrade to Firefox 151 or later, per Mozilla advisory MFSA2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/); Firefox Focus for Android users should update the app to the build incorporating the 151 engine fix via Google Play. Linux distribution users should apply the corresponding vendor Firefox package once shipped (track Red Hat at https://access.redhat.com/security/cve/CVE-2026-8945). No standalone workaround fully substitutes for the update, but until patching, reduce exposure by avoiding untrusted sites, disabling or restricting JavaScript on unknown pages (e.g., via NoScript/enhanced tracking protection), and enforcing browser auto-update policies in enterprise fleets - the trade-off of aggressive script blocking is broken functionality on legitimate sites, so scope it to high-risk browsing.

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Same technique Information Disclosure

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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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EUVD-2026-30897 vulnerability details – vuln.today
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