CVE-2026-76560: Auth Bypass (CVSS 7.5)

Description

A flaw was found in 389 Directory Server. The SELFDN ACI bind-rule evaluator incorrectly matches an anonymous LDAP client's empty bind DN against an empty stored attribute value, allowing an unauthenticated client to satisfy access control checks intended to require a matching authenticated identity. This can allow an anonymous LDAP client to perform an operation, such as adding or modifying a directory entry, that a SELFDN-based ACI intended to restrict to a specific authenticated user.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0037

Probability of exploitation

0.30%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-863 Incorrect Authorization

References

Other References

https://access.redhat.com/errata/RHSA-2026:64771 https://access.redhat.com/errata/RHSA-2026:64776 https://access.redhat.com/errata/RHSA-2026:64778 https://access.redhat.com/errata/RHSA-2026:64779 https://access.redhat.com/errata/RHSA-2026:64780 https://access.redhat.com/errata/RHSA-2026:64781 https://access.redhat.com/errata/RHSA-2026:64783 https://access.redhat.com/errata/RHSA-2026:64784 https://access.redhat.com/errata/RHSA-2026:64785 https://access.redhat.com/errata/RHSA-2026:64789

Frequently Asked Questions

What is CVE-2026-76560? +

A flaw was found in 389 Directory Server. The SELFDN ACI bind-rule evaluator incorrectly matches an anonymous LDAP client's empty bind DN against an empty stored attribute value, allowing an unauthenticated client to satisfy access control checks intended to require a matching authenticated identity. This can allow an anonymous LDAP client to perform an operation, such as adding or modifying a directory entry, that a SELFDN-based ACI intended to restrict to a specific authenticated user. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-76560? +

CVE-2026-76560 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0037, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-76560? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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