CVE-2025-4676

Authentication bypass via first-character token validation

Published Jan 7, 2026 · Updated Jan 7, 2026

Authentication bypass in ABB WebPro SNMP Card PowerValue products 1.1.8.k and earlier allows remote attackers to access the web HMI. The device web HMI validates only the first character of both the session cookie and authentication token, accepting arbitrary remaining characters. Access requires local-network position and user interaction; brute-forcing the two validated characters grants the HMI's authenticated privileges.

CVSS severity8.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in ABB WebPro SNMP Card PowerValue products 1.1.8.k and earlier allows remote attackers to access the web HMI. The device web HMI validates only the first character of both the session cookie and authentication token, accepting arbitrary remaining characters. Access requires local-network position and user interaction; brute-forcing the two validated characters grants the HMI's authenticated privileges.

The record

CVE
CVE-2025-4676
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
WebPro SNMP card PowerValue
Classifications
CWE-303, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.1.8.k

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

GENEREX SYSTEMS Computervertriebsgesellschaft mbH · WebPro SNMP card PowerValueversion=0 <=1.1.8.k
GENEREX SYSTEMS Computervertriebsgesellschaft mbH · WebPro SNMP card PowerValue ULversion=0 <=1.1.8.k

Published CVSS scores

8.8ABBCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
8.4ABBCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:H/SI:H/SA:H
7.5ABBCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:U

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-303Incorrect Implementation of Authentication Algorithm
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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