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

Source: https://junglewise.ai/threats/cve-2026-73644-opendj-sasl-plain-authzid-bypassing-the-proxy-aci-scope-check  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-13  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/org-openidentityplatform-opendj-opendj-server-legacy). Vendors: [Maven](https://junglewise.ai/threats/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

  ```sh
  # 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

## Related threats

- [OpenIdentityPlatform OpenDJ deserialization RCE in JMX RMI](https://junglewise.ai/threats/cve-2026-46495-openidentityplatform-opendj-deserialization-rce-in-jmx-rmi)
- [OpenDJ Denial of Service (DoS) using alias loop](https://junglewise.ai/threats/cve-2025-27497-opendj-denial-of-service-dos-using-alias-loop)