Cookie disclosure via retained cross-origin redirect header
Published Oct 12, 2023 · Updated Feb 13, 2025
Information disclosure in Node.js Undici before 5.26.2 allows remote attackers to read cookies through cross-origin fetch redirects. The httpRedirectFetch path deletes Authorization on an origin change but retains the caller-supplied Cookie header and forwards it to the redirect destination. The leak requires an application to set a Cookie header and follow a redirect to an attacker-controlled or third-party origin, exposing only that request's cookie data.
Summary
What happened
Information disclosure in Node.js Undici before 5.26.2 allows remote attackers to read cookies through cross-origin fetch redirects. The httpRedirectFetch path deletes Authorization on an origin change but retains the caller-supplied Cookie header and forwards it to the redirect destination. The leak requires an application to set a Cookie header and follow a redirect to an attacker-controlled or third-party origin, exposing only that request's cookie data.
The record
- CVE
- CVE-2023-45143
- Published
- Oct 12, 2023
- Updated
- Feb 13, 2025
- Vendor
- Node.js
- Product
- Undici
- Classifications
- CWE-200, T1539
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 12, 2023CVE publishedPublication date reported by the CVE source.
- Feb 13, 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=< 5.26.2
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
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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