CVE-2026-40459

LDAP Injection in PAC4J

HIGH

8.8

CVSS Score

Published: April 17, 2026 at 01:18 PM UTC

Updated: June 17, 2026 at 10:45 AM UTC

1 product affected across 1 vendorPAC4J

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Severity

HIGH8.8

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

PAC4J is vulnerable to LDAP Injection in multiple methods. A low-privileged remote attacker can inject crafted LDAP syntax into ID-based search parameters, potentially resulting in unauthorized LDAP queries and arbitrary directory operations. This issue was fixed in PAC4J versions 4.5.10, 5.7.10 and 6.4.1

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PAC4J · PAC4Jmaven

95%

4.0 ≤ v < 4.5.104.0.0 ≤ v < 4.5.105.0 ≤ v < 5.7.105.0.0 ≤ v < 5.7.106.0 ≤ v < 6.4.16.0.0 ≤ v < 6.4.14.0 5.0 6.0

Affected range stops below 4.5.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.7.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.pac4j.org/blog/security-advisory-pac4j-core-and-ldap.html

References (2)

Third Party Advisory

Source: cverecord

https://cert.pl/en/posts/2026/04/CVE-2026-40458/

Vendor Advisory

Source: cverecord

https://www.pac4j.org/blog/security-advisory-pac4j-core-and-ldap.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-90

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