Credential disclosure via HTTP 307 POST replay
Published Dec 23, 2023 · Updated Nov 4, 2025
Information disclosure in instipod DuoUniversalKeycloakAuthenticator 1.0.7 exposes login credentials through an HTTP 307 redirect. The challenge handler passes the Duo authorization URL to Response.temporaryRedirect, whose 307 response makes the browser repeat the original POST body at the Duo endpoint. Exposure occurs after a user completes initial Keycloak authentication and enters the Duo MFA step; the disclosed data is limited to the submitted username and password.
Summary
What happened
Information disclosure in instipod DuoUniversalKeycloakAuthenticator 1.0.7 exposes login credentials through an HTTP 307 redirect. The challenge handler passes the Duo authorization URL to Response.temporaryRedirect, whose 307 response makes the browser repeat the original POST body at the Duo endpoint. Exposure occurs after a user completes initial Keycloak authentication and enters the Duo MFA step; the disclosed data is limited to the submitted username and password.
The record
- CVE
- CVE-2023-49594
- Published
- Dec 23, 2023
- Updated
- Nov 4, 2025
- Vendor
- instipod
- Product
- DuoUniversalKeycloakAuthenticator
- Classifications
- CWE-201
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Dec 23, 2023CVE publishedPublication date reported by the CVE source.
- Nov 4, 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=1.0.7
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
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Weakness, pattern, technique
Public exploit references
- Cisco Talos credential-replay demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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