Unauthenticated content disclosure via declined content handler
Published Apr 6, 2025 · Updated Apr 17, 2025
Information disclosure in OpenIDC mod_auth_openidc before 2.4.16.11 allows remote attackers to read protected content via HTTP requests. When POST-bound authentication returns its self-submitting form, check_userid returns OK, but oidc_content_handler misses that request state and returns DECLINED, causing httpd to append the protected resource. Exposure requires OIDCProviderAuthRequestMethod POST, Require valid-user, and no application-level gateway that hides the extra response content.
Summary
What happened
Information disclosure in OpenIDC mod_auth_openidc before 2.4.16.11 allows remote attackers to read protected content via HTTP requests. When POST-bound authentication returns its self-submitting form, check_userid returns OK, but oidc_content_handler misses that request state and returns DECLINED, causing httpd to append the protected resource. Exposure requires OIDCProviderAuthRequestMethod POST, Require valid-user, and no application-level gateway that hides the extra response content.
The record
- CVE
- CVE-2025-31492
- Published
- Apr 6, 2025
- Updated
- Apr 17, 2025
- Vendor
- OpenIDC
- Product
- mod_auth_openidc
- Classifications
- CWE-200, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 6, 2025CVE publishedPublication date reported by the CVE source.
- Apr 17, 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=< 2.4.16.11
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
- Upstream raw-response disclosure demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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