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Apache

CVE-2025-66621: Apache James SASL OAuthBearer/XOAUTH2 prior versions 3.9.1 fails to validate correctly AUD claim of JWT payloads when introspection is not configured. This all

CVE-2025-66621 Nov 6, 2026 Source: Vendor

Apache James SASL OAuthBearer/XOAUTH2 prior versions 3.9.1 fails to validate correctly AUD claim of JWT payloads when introspection is not configured.

This allows an attacker with valid credentials to access the mail server even if they are not authorized to do so.

We recommend users to upgrade to non vulnerable version that forces explicit configuration of aud claims and forces introspection.

Source of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-66621
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Credited

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CVE-2025-66621 BR2026-0000-042925 unclaimed
Credited as The Apache James PMC would like to thanks Felix Auringer for this report