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CVE-2026-33322 is a JWT algorithm confusion vulnerability in MinIO's OpenID Connect authentication implementation. It affects MinIO releases from RELEASE.2022-11-08T05-27-07Z up to, but not including, RELEASE.2026-03-17T21-25-16Z. The flaw allows an attacker who knows the configured OIDC ClientSecret to forge arbitrary identity tokens. By presenting forged tokens, the attacker can cause MinIO to issue S3 credentials associated with attacker-chosen policies, including the highly privileged consoleAdmin policy. This is an authentication failure in the OIDC token validation path that results in acceptance of attacker-controlled identity assertions.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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