CVE-2026-12503

Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter

State: Published
Severity: 9.2 Critical
Published: Jul 24, 2026
Updated: Jul 24, 2026
Reserved: Jun 17, 2026

Description

Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `larmapp` attacker to make `/etc/passwd` writable by the `larmapp` group (leading to root privilege escalation) via a symlink attack on `/etc/lighttpd/ssl/server.pem`.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N	NCSC.ch

Weaknesses

CWE-59 Improper link resolution before file access ('link following')

Affected Products

Product	Versions
LIP-ME20xCLoytec	8.4.16 and earlierAffected
L-INXLoytec	8.4.16 and earlierAffected
L-GATELoytec	8.4.16 and earlierAffected
L-ROCLoytec	8.4.16 and earlierAffected
L-IOBLoytec	8.4.16 and earlierAffected
L-DALILoytec	8.4.16 and earlierAffected
L-VISLoytec	8.4.16 and earlierAffected
L-PADLoytec	8.4.16 and earlierAffected

References

https://www.loytec.com/support/product-security/advisories/8520-dibt-cve-20260526-0002-symlink-following-in-chown-chmod-criticalvendor-advisory

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