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CVE-2026-2331: CVE-2026-2331

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-552

Description

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.

Affected products

• SICK AG SICK Lector83x: from 2.6.0 through 2.7.0
• SICK AG SICK Lector85x: from 2.6.0 through 2.7.0

References

• https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
• https://www.first.org/cvss/calculator/3.1
• https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0006.json
• https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0006.pdf
• https://www.sick.com/media/docs/9/19/719/special_information_sick_operating_guidelines_cybersecurity_by_sick_en_im0106719.pdf
• https://www.sick.com/psirt

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