Auth bypass in Socomec Diris A-40
CVE-2026-2491
Socomec DIRIS A-40 HTTP API Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of Socomec DIRIS A-40 power monitoring devices. Authentication is not required to exploit this vulnerability. The specific flaw exists within the web API implementation, which listens on TCP port 80 by default. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-23993.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Socomec Diris A-40 — versions 1.8.1
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-26-129/ (x_research-advisory)
- emea.socomec.com/en/resource-center/resource-type/cyber-vulnerabilities-601 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-2491?
- CVE-2026-2491 is a medium-severity vulnerability in Socomec Diris A-40, classified under Missing Authentication for Critical Function. CVSS score: 6.3/10. Published 2026-03-16.
- How severe is CVE-2026-2491?
- Medium severity. CVSS v3 base score is 6.3 out of 10.