CVE-2026-73644 OpenDJ SASL PLAIN authzid bypassing the proxy ACI scope check
An authenticated user with PROXIED_AUTH privilege can impersonate any non-root user in OpenDJ, bypassing proxy ACI restrictions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73644?
CVE-2026-73644 is a critical authentication bypass vulnerability in OpenIdentityPlatform OpenDJ, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-73644?
2 open source packages ship an affected version, including org.openidentityplatform.opendj:opendj-server-legacy.
| Package | Affected | Fixed in |
|---|---|---|
org.openidentityplatform.opendj:opendj-server-legacy Maven | All versions | 5.1.2 |
org.openidentityplatform.opendj:opendj-server-legacy Maven | All versions | 5.1.2 |
How do I fix CVE-2026-73644?
Upgrade org.openidentityplatform.opendj:opendj-server-legacy to 5.1.2 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-73644 being exploited?
There is no known exploitation of CVE-2026-73644 in the wild and no public exploit code.
Sources
Also known as GHSA-p279-2cqp-84jg.