What is CVE-2026-34578?

CVE-2026-34578 is a high-severity vulnerability in Opnsense Core, classified under LDAP Injection. CVSS score: 8.2/10. Published 2026-04-09.

How severe is CVE-2026-34578?

High severity. CVSS v3 base score is 8.2 out of 10.

LDAP Injection in Opnsense Core

CVE-2026-34578

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.6, OPNsense's LDAP authentication connector passes the login username directly into an LDAP search filter without calling ldap_escape(). An unauthenticated attacker c…

EPSS: 0.003 (49.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.

Affected products

Opnsense Core — versions < 26.1.6

Weakness classification (CWE)

CWE-90 — LDAP Injection

References

https://github.com/opnsense/core/security/advisories/GHSA-jpm7-f59c-mp54 (x_refsource_CONFIRM)
https://github.com/opnsense/core/commit/016f66cb4620cd48183fa97843f343bb71813c6e (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34578?: CVE-2026-34578 is a high-severity vulnerability in Opnsense Core, classified under LDAP Injection. CVSS score: 8.2/10. Published 2026-04-09.
How severe is CVE-2026-34578?: High severity. CVSS v3 base score is 8.2 out of 10.