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