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CVE-2026-73644— OpenDJ: Authorization bypass in SASL PLAIN allowing a `proxied-auth` holder to impersonate any resolvable non-root user without an ACI proxy grant

Quick assessment

Affected
OpenIdentityPlatform OpenDJ
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open Identity Platform OpenDJ是Open Identity Platform组织开源的一个目录服务。 Open Identity Platform OpenDJ 5.1.2之前版本存在授权问题漏洞，该漏洞源于SASL PLAIN授权身份路径未评估mayProxy代理ACI范围，可能导致已认证账户冒充任何可解析的非root身份。

CVSS 9.6 · Critical EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenIdentityPlatform OpenDJ < 5.1.2 affected
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I. Basic Information for CVE-2026-73644

Vulnerability Information
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Vulnerability Title
OpenDJ: Authorization bypass in SASL PLAIN allowing a `proxied-auth` holder to impersonate any resolvable non-root user without an ACI proxy grant
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Open Identity Platform OpenDJ 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Identity Platform OpenDJ是Open Identity Platform组织开源的一个目录服务。 Open Identity Platform OpenDJ 5.1.2之前版本存在授权问题漏洞，该漏洞源于SASL PLAIN授权身份路径未评估mayProxy代理ACI范围，可能导致已认证账户冒充任何可解析的非root身份。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenIdentityPlatform OpenDJ < 5.1.2 -

II. Public POCs for CVE-2026-73644

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10918 chars
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III. Intelligence Information for CVE-2026-73644

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Patches & Fixes for CVE-2026-73644 (1)

Vendor Advisories for CVE-2026-73644 (1)

Vendor Pages for CVE-2026-73644 (1)

IV. Related Vulnerabilities

Same product: OpenDJ
Same vendor: OpenIdentityPlatform
Same weakness: CWE-285

V. Comments for CVE-2026-73644

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