# CVE-2026-73644

## Summary

- **CVE ID:** CVE-2026-73644
- **Severity:** CRITICAL
- **CVSS Score:** 9.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N)
- **CWE:** CWE-285, CWE-639
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 18, 2026

## Description

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.

## Affected Products

- OpenIdentityPlatform — OpenDJ (< 5.1.2)

## References

- [CNA](https://github.com/OpenIdentityPlatform/OpenDJ/security/advisories/GHSA-p279-2cqp-84jg)
- [CNA](https://github.com/OpenIdentityPlatform/OpenDJ/commit/5c326850f1ab945cfca7ac9c5aaf77d1052c6bed)
- [CNA](https://github.com/OpenIdentityPlatform/OpenDJ/releases/tag/5.1.2)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 22.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._