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Apache APISIX EUVDEUVD-2026-66956

| CVE-2026-75020 HIGH
LDAP Injection (CWE-90)
2026-08-26 GHSA-fm68-53hc-8wxg
Apache Code Injection LDAP
7.0
CVSS 4.0 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.0 HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.6 CRITICAL

Network-reachable via LDAP auth endpoint; low-privilege credential required; scope changes as attacker assumes a different consumer identity with distinct permissions; no availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Primary rating from Vendor (CNA).

CVSS VectorVendor

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
CVSS changed
Aug 27, 2026 - 10:22 NVD
7.0 (HIGH)
Analysis Generated
Aug 26, 2026 - 16:21 vuln.today
CVE Published
Aug 26, 2026 - 15:29 oss-security
CRITICAL

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Articles & Coverage 3

News 3 New Apache Vulnerabilities - 3 High Severity Aug 27, 2026 News 3 New Redis Vulnerabilities - 1 Critical, 2 High Severity Aug 26, 2026 News Critical LDAP Injection in Grafana - CVE-2026-75020 Aug 26, 2026

AnalysisAI

LDAP injection in Apache APISIX's ldap-auth plugin allows a caller holding valid credentials for any LDAP directory entry to authenticate to the gateway as a different consumer - including entries outside the subtree the plugin was configured to restrict access to. Affected versions span 2.11.0 through 3.17.0, covering several years of releases. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege LDAP credentials
Delivery
Identify APISIX route using ldap-auth plugin
Exploit
Craft LDAP injection payload in auth request
Execution
Plugin resolves injected query to target consumer entry
Persist
Authenticate as high-privilege APISIX consumer
Impact
Access restricted upstream APIs or data
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the ldap-auth plugin is actively configured on at least one APISIX route or consumer - the vulnerability does not affect deployments that do not use this plugin. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The risk profile is driven primarily by the scope of the identity escalation: the attacker already holds valid LDAP credentials but can elevate to any APISIX consumer mapped in the directory, effectively bypassing the subtree-based access boundary the plugin enforces. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker provisioned with a low-privilege LDAP account (e.g., a service account in a restricted OU) sends a crafted authentication request to an APISIX route protected by ldap-auth, embedding LDAP metacharacters in the credential fields. The ldap-auth plugin constructs a malformed LDAP search filter that matches a different directory entry - one mapped to a high-privilege APISIX consumer with access to internal or administrative API routes - and returns a successful authentication for that impersonated identity. …
Remediation The primary remediation is to upgrade Apache APISIX to version 3.18.0, which contains the fix per the Apache project's own recommendation in the advisory. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all APISIX deployments and identify instances running ldap-auth plugin in versions 2.11.0 through 3.17.0; document their network exposure and protected backend systems. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-66956 vulnerability details – vuln.today
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