Site-isolation failure in DOM Push Subscriptions
Published Sep 1, 2026 · Updated Sep 3, 2026
A site-isolation issue in DOM Push Subscriptions affects Firefox and Thunderbird before 155 and their ESR lines before 153.2. The public record does not disclose the code locus or the wrong operation performed on untrusted input within the component. The attacker position, privilege gate, required interaction, and resulting confidentiality, integrity, or availability impact remain unspecified.
Summary
What happened
A site-isolation issue in DOM Push Subscriptions affects Firefox and Thunderbird before 155 and their ESR lines before 153.2. The public record does not disclose the code locus or the wrong operation performed on untrusted input within the component. The attacker position, privilege gate, required interaction, and resulting confidentiality, integrity, or availability impact remain unspecified.
The record
- CVE
- CVE-2026-84133
- Published
- Sep 1, 2026
- Updated
- Sep 3, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 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
No CVSS assessment is available in this record.
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
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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