CVE-2026-1626
Published: 27 February 2026
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 6.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Contacts with security groups provide timely information on broken or risky cryptographic algorithms, reducing the likelihood of their selection and use.
Ongoing education and sharing of recommended practices helps organizations identify and migrate away from broken or risky cryptographic algorithms.
Cross-organization threat feeds commonly include advances in cryptanalysis and active exploits against weak or broken algorithms, allowing organizations to deprecate them proactively.
Capital planning and funding allow selection and ongoing support of strong cryptographic algorithms rather than weak or broken ones.
Risk updates surface newly-broken or risky cryptographic algorithms as threat intelligence and computing advances evolve, enabling timely replacement.
Scanners flag use of broken or weak cryptographic algorithms via known-vulnerability databases.
Enforces approved cryptographic algorithms for each use case, blocking use of broken or risky algorithms.
Flaw remediation replaces broken or risky cryptographic algorithms once safer implementations are released by vendors.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Weak CBC ciphers in SSH directly constitute weakened encryption (T1600) and enable MITM-style observation/manipulation of sessions (T1557).
NVD Description
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.
Deeper analysisAI
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.
Details
- CWE(s)