CVE-2026-12503CWE-59

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

Critical · published July 24, 2026

CVSS v4.0
9.2
EPSS
0%
Percentile
7.3
In the wild
Unconfirmed
What it is

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`.

The record
Technical detail
CVSS v4.0
9.2 · CRITICAL
Vector
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
EPSS
0.00181 · 7.3th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-07-24T13:57Z
EPSS history
Timeline
  • 24 JUL 13:57Z
    Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter
    cvelistv5