CVE-2026-12503: critical vulnerability in Loytec L-INX
Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.2epss 0.2%
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`.
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
Affected products
Loytec · L-DALILoytec · L-GATELoytec · L-INXLoytec · L-IOBLoytec · LIP-ME20xCLoytec · L-PADLoytec · L-ROCLoytec · L-VISRelated CVEs — Loytec L-INX
In the same product, most dangerous first.
CVE-2026-12496HIGHLoytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA serverEPSS 0.6%CVE-2026-55732HIGHLoytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)EPSS 0.5%CVE-2026-55731MEDIUMLoytec LINX firmware: Unchecked input for loop condition in the SNMP agentEPSS 0.5%CVE-2026-12504HIGHLoytec LINX firmware: Improper Authentication in PAM configurationEPSS 0.2%CVE-2026-55728LOWLoytec LINX firmware: Stack-based Buffer Overflow in cmd_ipaddr_conflictEPSS 0.2%CVE-2026-12502HIGHLoytec LINX firmware: Improper Privilege Management in /usr/bin/ltsudoEPSS 0.2%