Cross-origin URL disclosure via misplaced violation events
Published Dec 22, 2022 · Updated Apr 16, 2025
Cross-origin information disclosure in Firefox before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 exposes URLs to remote attackers. For blocked frame-ancestors embeddings, the DOM security code incorrectly sends the parent a SecurityPolicyViolationEvent containing the framed document's final post-redirect documentURI. A victim must load attacker-controlled content that frames a cross-origin page whose CSP rejects the parent; the leak reveals the destination URL but does not alter data or interrupt service.
Summary
What happened
Cross-origin information disclosure in Firefox before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 exposes URLs to remote attackers. For blocked frame-ancestors embeddings, the DOM security code incorrectly sends the parent a SecurityPolicyViolationEvent containing the framed document's final post-redirect documentURI. A victim must load attacker-controlled content that frames a cross-origin page whose CSP rejects the parent; the leak reveals the destination URL but does not alter data or interrupt service.
The record
- CVE
- CVE-2022-22745
- Published
- Dec 22, 2022
- Updated
- Apr 16, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 22, 2022CVE publishedPublication date reported by the CVE source.
- Apr 16, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <96
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
- Mozilla Bugzilla cross-origin URL leak reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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