CVE-2026-1626

Medium

Published: 27 February 2026

Published

27 February 2026

Modified

05 March 2026

KEV Added

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Patch

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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Score 0.0020 9.7th percentile

Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-1626 is a medium-severity Use of a Broken or Risky Cryptographic Algorithm (CWE-327) vulnerability in Sick Lms1000 Firmware. Its CVSS base score is 6.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Adversary-in-the-Middle (T1557); ranked at the 9.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SC-13 (Cryptographic Protection) and SC-8 (Transmission Confidentiality and Integrity).

Deeper analysis

CVE-2026-1626 involves the use of weak CBC-based cipher suites in the SSH service of affected devices, enabling potential observation or manipulation of parts of encrypted SSH communication by an attacker able to intercept or interact with network traffic. This vulnerability, linked to CWE-327 (Use of a Broken or Risky Cryptographic Algorithm), was published on 2026-02-27 and has a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).

Attackers with network access can exploit this vulnerability if they position themselves to intercept SSH traffic, requiring low attack complexity and no privileges, though user interaction is needed. Successful exploitation allows high-impact confidentiality breaches, such as observing sensitive data in SSH sessions, but does not affect integrity or availability.

Advisories and mitigation guidance are provided by SICK PSIRT at https://sick.com/psirt, including detailed CSAF documents such as https://www.sick.com/.well-known/csaf/white/2026/sca-2026-0005.json and the corresponding PDF. Additional resources include CISA ICS recommended practices at https://www.cisa.gov/resources-tools/resources/ics-recommended-practices and the CVSS v3.1 calculator at https://www.first.org/cvss/calculator/3.1.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-9008

Vulnerability details

An attacker may exploit the use of weak CBC-based cipher suites in the device’s SSH service to potentially observe or manipulate parts of the encrypted SSH communication, if they are able to intercept or interact with the network traffic.

CWE(s): CWE-327

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1557 Adversary-in-the-Middle Credential Access

Adversaries may attempt to position themselves between two or more networked devices using an adversary-in-the-middle (AiTM) technique to support follow-on behaviors such as [Network Sniffing](https://attack.

attack.mitre.org →

T1600 Weaken Encryption Defense Impairment

Adversaries may compromise a network device’s encryption capability in order to bypass encryption that would otherwise protect data communications.

attack.mitre.org →

Why these techniques?

Weak CBC ciphers in SSH directly constitute weakened encryption (T1600) and enable MITM-style observation/manipulation of sessions (T1557).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0