CVE-2026-12503

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

No CVSS.

References

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

Configurations

No configuration.

History

24 Jul 2026, 15:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-24 15:17

Updated : 2026-07-27 20:32

NVD link : CVE-2026-12503

Mitre link : CVE-2026-12503

CVE.ORG link : CVE-2026-12503

JSON object : View

Products Affected

No product.

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

{"id": "CVE-2026-12503", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12503", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-24T14:57:37.633031Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "vulnerability@ncsc.ch", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.2, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "vulnerability@ncsc.ch", "affectedData": [{"vendor": "Loytec", "product": "LIP-ME20xC", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-INX", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-GATE", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-ROC", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-IOB", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-DALI", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-VIS", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}, {"vendor": "Loytec", "product": "L-PAD", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "8.4.16"}], "defaultStatus": "unaffected"}]}], "published": "2026-07-24T15:17:10.997", "references": [{"url": "https://www.loytec.com/support/product-security/advisories/8520-dibt-cve-20260526-0002-symlink-following-in-chown-chmod-critical", "source": "vulnerability@ncsc.ch"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "vulnerability@ncsc.ch", "description": [{"lang": "en", "value": "CWE-59"}]}], "descriptions": [{"lang": "en", "value": "Improper Link Resolution (CWE-59)\u00a0in `/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`."}], "lastModified": "2026-07-27T20:32:11.620", "sourceIdentifier": "vulnerability@ncsc.ch"}

CVE-2026-12503

JSON object

Attach tags to CVE-2026-12503

Attach tags to `CVE-2026-12503`