Cross-origin URL disclosure via performance entries
Published Dec 22, 2022 · Updated Apr 15, 2025
Same-origin policy bypass in Firefox before 106, Firefox ESR before 102.4, and Thunderbird before 102.4 allows attackers to read cross-origin URLs. LoadInfo handling selected performance storage using an inner-window identifier instead of always retrieving the request's PerformanceStorage, allowing embedded redirect resources to be recorded where a framing origin could enumerate them. Exploitation requires attacker-controlled content to frame and redirect another origin plus user interaction to load it; the demonstrated consequence is disclosure of redirect-result URL entries.
Summary
What happened
Same-origin policy bypass in Firefox before 106, Firefox ESR before 102.4, and Thunderbird before 102.4 allows attackers to read cross-origin URLs. LoadInfo handling selected performance storage using an inner-window identifier instead of always retrieving the request's PerformanceStorage, allowing embedded redirect resources to be recorded where a framing origin could enumerate them. Exploitation requires attacker-controlled content to frame and redirect another origin plus user interaction to load it; the demonstrated consequence is disclosure of redirect-result URL entries.
The record
- CVE
- CVE-2022-42927
- Published
- Dec 22, 2022
- Updated
- Apr 15, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-346
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 22, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=unspecified <106
What conditions does exploitation require?
What is affected?
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
- Bugzilla cross-origin URL disclosure proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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