Authenticated security-control bypass in DOM Security
Published Apr 21, 2026 · Updated Apr 21, 2026
Mitigation bypass in DOM Security in Mozilla Firefox and Thunderbird before 150 allows remote authenticated users to bypass security controls. Mozilla has not disclosed the affected DOM operation or the incorrect processing of untrusted input that defeats the mitigation. Exploitation requires low-privileged access and user interaction; the public record does not specify which data or privileges become reachable after the bypass.
Summary
What happened
Mitigation bypass in DOM Security in Mozilla Firefox and Thunderbird before 150 allows remote authenticated users to bypass security controls. Mozilla has not disclosed the affected DOM operation or the incorrect processing of untrusted input that defeats the mitigation. Exploitation requires low-privileged access and user interaction; the public record does not specify which data or privileges become reachable after the bypass.
The record
- CVE
- CVE-2026-6774
- Published
- Apr 21, 2026
- Updated
- Apr 21, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-693
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 21, 2026CVE publishedPublication date reported by the CVE source.
- Apr 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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