CVE-2026-73644: Openidentityplatform Opendj

Critical severity, CVSS 9.6. EPSS: 0.4% chance of exploitation in the next 30 days.

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: before 5.1.2 (fixed in 5.1.2)

Published 2026-08-13. Last modified 2026-09-18.