CVE-2026-79679Network attack vector

OPC UA access via low-entropy authenticators

Published Sep 3, 2026 · Updated Sep 3, 2026

Weak credentials in B&R mapp Services before 6.8.0 allow remote attackers to access the mapp Audit OPC UA server component. mapp Audit generates authenticators with insufficient entropy, making them guessable rather than resistant to prediction. Network reachability to an affected device is required, and successful use compromises the confidentiality and integrity of downstream OPC UA resources.

CVSS severity8.7
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak credentials in B&R mapp Services before 6.8.0 allow remote attackers to access the mapp Audit OPC UA server component. mapp Audit generates authenticators with insufficient entropy, making them guessable rather than resistant to prediction. Network reachability to an affected device is required, and successful use compromises the confidentiality and integrity of downstream OPC UA resources.

The record

CVE
CVE-2026-79679
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
B&R Industrial Automation GmbH
Product
mapp Services
Classifications
CWE-1391, T0859
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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 <6.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

B&R Industrial Automation GmbH · mapp Servicesversion=0 <6.8.0

Published CVSS scores

8.7ABB PSIRTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
7.0ABB PSIRTCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1391Use of Weak Credentials
T0859Valid Accounts

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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