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CVE-2026-74968

Site isolation issue in the Graphics: WebRender component

MEDIUM
5.4
CVSS Score
Published: August 18, 2026 at 12:23 PM UTC
Updated: August 20, 2026 at 08:25 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 153.1.0v < 154.0.0
Vendor states this is fixed in 153.1 (unaffected)
Affected range stops below 153.1.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 154 (unaffected)
Affected range stops below 154.0.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 153.1.0v < 154.0
Vendor states this is fixed in 153.1 (unaffected)
Affected range stops below 153.1.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 154 (unaffected)
Affected range stops below 154.0, so it looks safe — our inference, not a vendor statement

References (5)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2055738
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-74/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-77/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-78/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-80/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-346

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