CVE-2026-12504: Loytec LINX firmware: Improper Authentication in PAM configuration

Severity: high (CVSS 8.4 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-24 · updated 2026-07-27
Weakness: CWE-287

Description

Improper Authentication (CWE-287) in the PAM configuration in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows a local attacker to authenticate as a uid=0 account without a password and obtain a root shell via an `/etc/passwd` entry with an empty password field.

Affected products

Loytec L-DALI: through 8.4.16
Loytec L-GATE: through 8.4.16
Loytec L-INX: through 8.4.16
Loytec L-IOB: through 8.4.16
Loytec L-PAD: through 8.4.16
Loytec L-ROC: through 8.4.16
Loytec L-VIS: through 8.4.16
Loytec LIP-ME20xC: through 8.4.16

References

https://www.loytec.com/support/product-security/advisories/8521-dibt-cve-20260526-0003-pam-passwordless-uid-0-authentication-high

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