Cookie disclosure via unstripped cross-origin redirects
Published Jun 5, 2026 · Updated Jun 5, 2026
Cookie exposure in Async Http Client 2.x before 2.15.0 and 3.x before 3.0.10 allows remote attackers to read sensitive cookies via redirects. Redirect30xInterceptor.propagatedHeaders removes authorization headers at an origin boundary but retains the original request's Cookie header. Exploitation requires a client to follow an attacker-influenced redirect while that header is present, disclosing cookie values without altering data or interrupting service.
Summary
What happened
Cookie exposure in Async Http Client 2.x before 2.15.0 and 3.x before 3.0.10 allows remote attackers to read sensitive cookies via redirects. Redirect30xInterceptor.propagatedHeaders removes authorization headers at an origin boundary but retains the original request's Cookie header. Exploitation requires a client to follow an attacker-influenced redirect while that header is present, disclosing cookie values without altering data or interrupting service.
The record
- CVE
- CVE-2026-45300
- Published
- Jun 5, 2026
- Updated
- Jun 5, 2026
- Vendor
- AsyncHttpClient
- Product
- Async Http Client
- Classifications
- CWE-200, T1539
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 5, 2026CVE publishedPublication date reported by the CVE source.
- Jun 5, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.0.0, < 2.15.0
- Affected versionversion=>= 3.0.0.Beta1, < 3.0.10
What conditions does exploitation require?
What is affected?
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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