Dapr Sentry OIDC Discovery Host Header Injection (1.17-1.18)
CVE-2026-59096 Published on July 2, 2026
Dapr - OIDC Discovery Issuer and JWKS URI Injection via Unvalidated X-Forwarded-Host
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 Analysis
CVE-2026-59096 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
Origin Validation Error
The software does not properly verify that the source of data or communication is valid.
Products Associated with CVE-2026-59096
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Affected Versions
dapr:- Version 1.17.0 is affected.
- Version 1.18.0 is affected.