CVE-2026-12503

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.2
EG Score
9.2(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity92% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 24, 2026

Last Modified

July 27, 2026

Advisory Details (1)

Auto-updated Jul 24, 2026
No patch confirmed yet.
generic

DIBT-CVE 20260526-0002 Symlink Following in chown/chmod (CRITICAL)

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

Vendor Advisories for CVE-2026-12503(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-28 18:29 UTCGHSA enrichment
  2. 2026-07-28 14:06 UTCGHSA enrichment
  3. 2026-07-28 09:45 UTCGHSA enrichment
  4. 2026-07-28 05:24 UTCGHSA enrichment
  5. 2026-07-28 01:03 UTCGHSA enrichment
  6. 2026-07-27 20:43 UTCGHSA enrichment
  7. 2026-07-27 16:12 UTCEG score recompute
  8. 2026-07-27 16:12 UTCGHSA enrichment
  9. 2026-07-27 14:13 UTCEPSS rescore
  10. 2026-07-27 11:51 UTCGHSA enrichment
  11. 2026-07-27 07:30 UTCGHSA enrichment
  12. 2026-07-27 03:08 UTCGHSA enrichment
  13. 2026-07-26 22:47 UTCGHSA enrichment
  14. 2026-07-26 18:27 UTCEG score recompute
  15. 2026-07-26 18:27 UTCGHSA enrichment
  16. 2026-07-26 14:54 UTCEPSS rescore
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-26 14:05 UTCEG score recompute
  19. 2026-07-26 14:05 UTCGHSA enrichment
  20. 2026-07-26 09:43 UTCGHSA enrichment
  21. 2026-07-26 03:02 UTCEG score recompute
  22. 2026-07-26 03:01 UTCGHSA enrichment
  23. 2026-07-25 14:17 UTCEPSS rescore
  24. 2026-07-24 14:27 UTCEG score recompute
  25. 2026-07-24 14:26 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12503?
CVE-2026-12503 is a critical vulnerability published on July 24, 2026. 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…
When was CVE-2026-12503 disclosed?
CVE-2026-12503 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12503 actively exploited?
CVE-2026-12503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.6% of all scored CVEs.
What is the CVSS score of CVE-2026-12503?
CVE-2026-12503 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-12503?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12503, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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