CVE-2026-59096
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
A vulnerability in Dapr Sentry allows a remote unauthenticated attacker to poison the OIDC discovery document by manipulating the X-Forwarded-Host header. Relying parties performing dynamic discovery may fetch JWKS from an attacker-controlled server, leading to acceptance of forged JWT tokens.
Risk Assessment
The organization is at risk of OIDC authentication compromise, potentially resulting in unauthorized access to systems and data. An attacker can impersonate any user if the OIDC server is enabled without configured allowed-hosts lists.
Recommendation
Immediately configure the jwt-issuer or oidc-allowed-hosts parameter in Dapr Sentry to prevent attacks based on the X-Forwarded-Host header. Additionally, implement proxy header validation and reduce the cache lifetime of the discovery document.
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Original NVD description (English source)
Dapr Sentry's OIDC discovery endpoint derives the issuer and jwks_uri of the /.well-known/openid-configuration document from the request Host, honoring an attacker-controlled X-Forwarded-Host header without validation when no allowed-hosts list is configured (the default), and serves the document with a one-hour public cache lifetime. A remote unauthenticated attacker can poison the discovery document so relying parties performing dynamic (unpinned) discovery fetch the JWKS from an attacker-controlled server, causing attacker-signed JWTs to be accepted. Exploitation requires the OIDC server enabled without a configured jwt-issuer or oidc-allowed-hosts.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS