EUVD-2026-58186
GHSA-p279-2cqp-84jg
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Network-reachable, low-complexity bind requiring an authenticated account with the proxied-auth privilege (PR:L); impersonating other users breaks out of the auth scope (S:C) with high C/I and no availability impact.
Primary rating from Vendor (github).
CVSS VectorVendor: github
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Lifecycle Timeline
4Blast Radius
ecosystem impact- 64 maven packages depend on org.openidentityplatform.opendj:opendj-server-legacy (8 direct, 56 indirect)
Ecosystem-wide dependent count for version 5.1.2.
DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Authorization bypass in Open Identity Platform OpenDJ before 5.1.2 lets any authenticated account holding the proxied-auth privilege impersonate arbitrary non-root directory users during a SASL PLAIN bind. The PlainSASLMechanismHandler validated only the PROXIED_AUTH privilege but skipped the mayProxy ACI scope check, so the proxy ACIs meant to constrain which identities may be assumed were not enforced (CVSS 9.6). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated bind by an account that has been granted the proxied-auth privilege (ds-privilege-name: proxied-auth) and that the server accept a SASL PLAIN bind carrying an authorization identity (authzid) in dn:, u:, or bare form. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are largely aligned toward high real-world risk for affected deployments: CVSS 3.1 base 9.6 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N) reflects a network-reachable, low-complexity attack with a scope change and high confidentiality/integrity impact, and the vendor GHSA advisory independently confirms the authorization bypass and its impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who controls or compromises a low-value OpenDJ service account that happens to hold the proxied-auth privilege opens a SASL PLAIN bind and supplies an authzid (e.g. dn:cn=admin,o=corp or u:administrator) for a higher-value user the account was never granted a proxy ACI to impersonate. … |
| Remediation | Vendor-released patch: upgrade to OpenDJ 5.1.2, which adds the mayProxy ACI scope check to the SASL PLAIN authzid path (fix commit 5c326850f1ab945cfca7ac9c5aaf77d1052c6bed; release https://github.com/OpenIdentityPlatform/OpenDJ/releases/tag/5.1.2; advisory https://github.com/OpenIdentityPlatform/OpenDJ/security/advisories/GHSA-p279-2cqp-84jg). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running OpenDJ versions before 5.1.2 and audit which accounts hold the proxied-auth privilege; review authentication logs for suspicious proxy authentication activity in the past 30 days. …
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External POC / Exploit Code
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