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Mozilla Firefox EUVDEUVD-2026-60664

| CVE-2026-74967 MEDIUM
Origin Validation Error (CWE-346)
2026-08-18 mozilla GHSA-ppf2-9cwv-hpf8
Authentication Bypass Mozilla Red Hat Suse
5.4
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
vuln.today AI
6.1 MEDIUM

Network delivery, no privileges, user must visit attacker page (UI:R); same-origin bypass inherently crosses an isolation boundary (S:C), justifying scope change over the provided S:U; partial C/I reflects cross-origin data leakage only.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 20:44 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
MEDIUM 5.4
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Same-origin policy bypass in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Same-origin policy bypass in Firefox's Audio/Video Playback component exposes users to cross-origin data reads and limited content manipulation when visiting a malicious webpage. All Firefox stable releases prior to 154 and both ESR tracks prior to 140.14 and 153.1 are affected, with Mozilla issuing a coordinated advisory series (mfsa2026-74 through mfsa2026-80) covering the full release matrix. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker crafts malicious page with specially formed media element
Delivery
Target user visits page in unpatched Firefox
Exploit
Audio/Video Playback component misvalidates media origin
Execution
Same-origin policy boundary crossed
Impact
Attacker script reads or modifies cross-origin content
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to be running Mozilla Firefox in any version prior to 154 (stable), prior to 140.14 (ESR), or prior to 153.1 (ESR). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N yields a Medium score of 5.4, and the metrics are internally consistent with the described vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a webpage embedding a crafted audio or video element whose media content is engineered to trigger the origin validation error in Firefox's playback component. When a target user browses to this page in an unpatched Firefox, the media element causes the browser to misattribute the origin of a cross-origin resource, allowing the attacker's script to read data from or inject content into a different origin the user is authenticated to. …
Remediation Upgrade to Firefox 154 or later on the stable channel, Firefox ESR 140.14 or later, or Firefox ESR 153.1 or later - these are vendor-confirmed fixed versions per the CVE description and Mozilla advisory series. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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EUVD-2026-60664 vulnerability details – vuln.today
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