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PatchSiren cyber security CVE debrief

CVE-2025-4676 ABB CVE debrief

CVE-2025-4676 is a high-severity authentication bypass affecting ABB WebPro SNMP Card PowerValue web HMI access. The advisory says the device validates only the first character of the session cookie and authentication token, which can let an attacker brute force those characters and bypass authentication.

Vendor
ABB
Product
WebPro SNMP Card
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-07
Original CVE updated
2026-05-12
Advisory published
2026-01-07
Advisory updated
2026-05-12

Who should care

OT and facility teams running ABB WebPro SNMP Card PowerValue devices, especially administrators responsible for web HMI access, remote management paths, and segmented industrial networks.

Technical summary

According to the advisory, the device web HMI authenticates users by checking only the first character of the session cookie and bearer token. If those first characters are correct, the user is validated. This weak verification enables an authentication bypass, and ABB states the issue is corrected in WebPro SNMP Card PowerValue version 1.1.8.p.

Defensive priority

High. This is an authentication-bypass issue with a CVSS 3.1 score of 8.8 and high confidentiality, integrity, and availability impact. Prioritize patching or compensating controls for any exposed or reachable HMI instance.

Recommended defensive actions

  • Upgrade affected ABB WebPro SNMP Card PowerValue systems to version 1.1.8.p or later, where ABB says the issue is corrected.
  • If immediate upgrade is not feasible, follow ABB's 'Mitigation factors' and 'General security recommendations' in the product instruction manual.
  • Contact ABB Digital Service Support at [email protected] for guidance and recommended actions.
  • Apply CISA ICS recommended practices, including defense-in-depth and limiting exposure of the web HMI to only authorized management paths.
  • Restrict and monitor access to the device management interface, especially on OT networks where HMI exposure is unnecessary.

Evidence notes

The supplied CISA CSAF advisory ICSA-26-132-06 was first published on 2026-01-07T00:30:00Z and republished on 2026-05-12T06:00:00Z from ABB PSIRT advisory 2CRT000009. The advisory text explicitly describes the flaw as validation of only the first character of the session cookie and authentication token. The provided CVSS vector is AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H. No CISA KEV entry was provided in the source corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-4676 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-4676

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-4676 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-4676

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-132-06.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://psirt.abb.com/csaf/2026/2crt000009.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-132-06

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.