CVE-2026-73644: OpenDJ SASL PLAIN authzid bypassing the proxy ACI scope check

CVE-2026-73644 · Severity: critical · CVSS 9.6 · Published 2026-08-13

OpenDJ is an LDAPv3 compliant directory service. Prior to 5.1.2, the SASL PLAIN authorization identity path in opendj-server-legacy/src/main/java/org/opends/server/extensions/PlainSASLMechanismHandler.java checked the PROXIED_AUTH privilege but did not evaluate the mayProxy proxy ACI scope when an authzid resolved to a different user. Both dn: and u: or bare authzid forms could therefore let an authenticated account holding PROXIED_AUTH assume any resolvable non-root identity outside the identities permitted by its proxy ACI. The fix returns INVALID_CREDENTIALS (49) before password verification when the target authorization identity is not permitted. This issue is fixed in version 5.1.2.

Technologies: org.openidentityplatform.opendj:opendj-server-legacy (Maven). Vendors: Maven.

Quick answers

Is CVE-2026-73644 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-73644 being exploited in the wild.
How severe is CVE-2026-73644?
Critical severity, with a CVSS score of 9.6, published 13 August 2026.
Which products and versions are affected?
org.openidentityplatform.opendj:opendj-server-legacy (Maven) ECOSYSTEM:introduced=0,fixed=5.1.2.
Is there a fix for CVE-2026-73644?
Yes. org.openidentityplatform.opendj:opendj-server-legacy (Maven): upgrade to 5.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-73644?
Check whether you run org.openidentityplatform.opendj:opendj-server-legacy (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.openidentityplatform.opendj:opendj-server-legacy (Maven): upgrade to 5.1.2 or later
    # set org.openidentityplatform.opendj:opendj-server-legacy to 5.1.2 in your pom.xml or build.gradle

Affected products

  • org.openidentityplatform.opendj:opendj-server-legacy (Maven) ECOSYSTEM:introduced=0,fixed=5.1.2

Identifiers

  • CVE-2026-73644
  • GHSA-p279-2cqp-84jg

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