What is CVE-2026-2331?

CVE-2026-2331 is a critical-severity vulnerability in Sick Ag Lector83x, classified under Files or Directories Accessible to External Parties. CVSS score: 9.8/10. Published 2026-03-06.

How severe is CVE-2026-2331?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Sick Ag Lector83x

CVE-2026-2331

An attacker may perform unauthenticated read and write operations on sensitive filesystem areas via the AppEngine Fileaccess over HTTP due to improper access restrictions. A critical filesystem directory was unintentionally exposed through the HTTP-based file access feature, allowing access without authentication. This includes device parameter files, enabling an attacker to read and modify application settings, including customer-defined passwords. Additionally, exposure of the custom application directory may allow execution of arbitrary Lua code within the sandboxed AppEngine environment.

Published 2026-03-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Sick Ag Lector83x — versions 2.6.0
Sick Ag Lector85x — versions 2.6.0

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

www.sick.com/psirt (x_SICK PSIRT Security Advisories)
www.sick.com/media/docs/9/19/719/special_information_sick_operating_guidelines_… (x_SICK Operating Guidelines)
www.cisa.gov/resources-tools/resources/ics-recommended-practices (x_ICS-CERT recommended practices on Industrial Security)
www.first.org/cvss/calculator/3.1 (x_CVSS v3.1 Calculator)
www.sick.com/.well-known/csaf/white/2026/sca-2026-0006.json (x_The canonical URL.)
www.sick.com/.well-known/csaf/white/2026/sca-2026-0006.pdf (vendor-advisory)

Frequently asked questions

What is CVE-2026-2331?: CVE-2026-2331 is a critical-severity vulnerability in Sick Ag Lector83x, classified under Files or Directories Accessible to External Parties. CVSS score: 9.8/10. Published 2026-03-06.
How severe is CVE-2026-2331?: Critical severity. CVSS v3 base score is 9.8 out of 10.