Credential disclosure via cross-origin redirect propagation
Published Apr 18, 2026 · Updated Apr 18, 2026
Origin validation failure in Async Http Client before 2.14.5 and 3.0.0.Beta1 through 3.0.8 allows remote attackers to steal credentials. Redirect30xInterceptor propagates Authorization and Proxy-Authorization headers and retains Realm credentials without comparing the destination scheme, host, or port. Redirect following and an attacker-controlled cross-origin target or HTTP man-in-the-middle position are required; exposed data includes bearer tokens and Basic or Digest credentials.
Summary
What happened
Origin validation failure in Async Http Client before 2.14.5 and 3.0.0.Beta1 through 3.0.8 allows remote attackers to steal credentials. Redirect30xInterceptor propagates Authorization and Proxy-Authorization headers and retains Realm credentials without comparing the destination scheme, host, or port. Redirect following and an attacker-controlled cross-origin target or HTTP man-in-the-middle position are required; exposed data includes bearer tokens and Basic or Digest credentials.
The record
- CVE
- CVE-2026-40490
- Published
- Apr 18, 2026
- Updated
- Apr 18, 2026
- Vendor
- AsyncHttpClient
- Product
- Async Http Client
- Classifications
- CWE-200, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 18, 2026CVE publishedPublication date reported by the CVE source.
- Apr 18, 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=< 2.14.5
- Affected versionversion=>= 3.0.0.Beta1, < 3.0.9
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
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Technologies
Your stack
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Your stack
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