CVE-2026-6762
Spoofing issue in the DOM: Core & HTML component
MEDIUM
6.3
CVSS Score
Published: April 21, 2026 at 12:40 PM UTC
Updated: October 26, 2026 at 10:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird
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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit
Description
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 140.10.0v < 150.0
Vendor states this is fixed in 115.35 (unaffected)
Vendor states this is fixed in 140.10 (unaffected)
Vendor states this is fixed in 150 (unaffected)
140.0 ≤ v < 140.10.0
Vendor states this is fixed in 140.10 (unaffected)
Vendor states this is fixed in 150 (unaffected)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (6)
SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
6.3MEDIUMCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- LOW
Vector?
Quick Info
StatusANALYZED
CWE
CWE-290
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