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Mozilla Firefox CVE-2026-74974

| EUVDEUVD-2026-60669 MEDIUM
Origin Validation Error (CWE-346)
2026-08-18 mozilla GHSA-xppv-6m94-c745
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
5.4 MEDIUM

Client-side browser flaw triggered solely by page visit (UI:R, PR:N, AV:N); limited cross-origin read/write with no availability impact and unchanged scope matching description.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/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:N/SI:N/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 - 20:30 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 Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Same-origin policy bypass in Firefox's ImageLib image rendering component allows remote attackers to read cross-origin data or perform unauthorized cross-origin writes against victims using unpatched browser versions. Affected releases span the main Firefox channel (prior to 154) and three ESR branches (prior to ESR 115.39, ESR 140.14, and ESR 153.1), placing a large share of the global Firefox install base at risk until patched. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious page with crafted image payload
Delivery
Victim visits attacker-controlled URL in unpatched Firefox
Exploit
Firefox ImageLib decodes crafted image resource
Execution
Origin validation check fails (CWE-346), SOP boundary not enforced
Persist
Attacker script reads or modifies cross-origin response data
Impact
Cross-origin data exfiltrated or cross-origin action performed
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Vulnerability AssessmentAI

Exploitation The CVSS vector UI:R confirms that victim user interaction is mandatory - the victim must navigate to or be redirected to an attacker-controlled web page while using an affected Firefox version; passive interception attacks are insufficient. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 5.4 medium score (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N) captures a network-accessible, low-complexity vulnerability that requires no attacker authentication but does require user interaction - the victim must visit a malicious page. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious web page that serves a specially constructed image resource designed to trigger the origin validation failure in Firefox's ImageLib component. When a victim using an unpatched Firefox version visits or is redirected to the page, ImageLib processes the image and incorrectly bypasses the same-origin policy, permitting the attacker-controlled page to read data from or write to a cross-origin context - for example, reading response content from an authenticated internal application open in another tab. …
Remediation Upgrade to Firefox 154 on the main release channel, or apply the appropriate ESR update: Firefox ESR 115.39, Firefox ESR 140.14, or Firefox ESR 153.1, depending on which ESR track is deployed in your environment. … 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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CVE-2026-74974 vulnerability details – vuln.today
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