CVE-2026-40459

Severity CVSS v4.0:

HIGH

Type:

Unavailable / Other

Publication date:

17/04/2026

Last modified:

20/04/2026

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.<br /> <br /> This issue was fixed in PAC4J versions 4.5.10, 5.7.10 and 6.4.1

Impact

Vector 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 8.70 HIGH
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): Low
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): High
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0

8.70

Severity 4.0

HIGH

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:pac4j:pac4j::::::::	4.0.0 (including)	4.5.10 (excluding)
cpe:2.3:a:pac4j:pac4j::::::::	5.0.0 (including)	5.7.10 (excluding)
cpe:2.3:a:pac4j:pac4j::::::::	6.0.0 (including)	6.4.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-40459

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools