CVE-2026-73644

Critical

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.

SeverityCritical

CVSS9.6

Exploit probability—

ProductOrg.openidentityplatform.opendj:opendj-server-legacy

PublishedAug 13, 2026

First seenAug 13, 2026

Weakness typeCWE-285CWE-285 CWE-639Authorization bypass through user-controlled key

How to fix

Update

org.openidentityplatform.opendj:opendj-server-legacy5.1.2 or later

Affected products

Product	Affected versions	Fixed in
org.openidentityplatform.opendj:opendj-server-legacyMaven	v < 5.1.2	5.1.2

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