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VulnerabilityPublished

CVE-2025-66621: Apache James SASL OAuthBearer/XOAUTH2 prior versions 3.9.1 fails to validate correctly AUD claim of

Source GCVE Database

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Authoritative record:CVE-2025-66621· High

Not known to be exploited : upgrade to 3.9.1 soon.

Data as of 6 Nov 2026, 13:23 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 3.9.1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade Apache James and org.apache.james/apache-james-server to 3.9.1.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache JamesAffected
  • >=3.9.0 <3.9.1
Fixed in
  • 3.9.1
Mavenorg.apache.james/apache-james-serverpkg:maven/org.apache.james/apache-james-serverOther threatsAffected
  • >=3.9.0 <3.9.1
Fixed in
  • 3.9.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Apache James SASL OAuthBearer/XOAUTH2 to version 3.9.1 or later, which fixes the AUD claim validation issue by enforcing explicit configuration and token introspection. No other mitigation steps are indicated.

Description

Apache James SASL OAuthBearer/XOAUTH2 versions prior to 3.9.1 do not correctly validate the AUD claim in JWT payloads when introspection is not configured. This flaw allows attackers with valid credentials to access the mail server without proper authorization. Users are advised to upgrade to version 3.9.1 or later, which enforces explicit AUD claim configuration and introspection.

References

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