CVE-2026-6900
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper certificate validation vulnerability in B&R Industrial Automation GmbH APROL. This issue affects APROL: before R 4.4-01P5.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceImproper certificate validation in B&R APROL allows attackers to perform man-in-the-middle attacks by presenting invalid or forged SSL/TLS certificates, potentially intercepting encrypted communications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify B&R APROL installationCheck for APROL installation directories (typical paths: C:\Program Files\BR\APROL, /opt/br/aprol) or query the system registry on Windows using reg query HKLM\SOFTWARE\BR\APROL or check for aprol-related services on Linux using systemctl list-units | grep -i aprolAffected if APROL is not installed on the system, then this CVE does not apply
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Determine installed APROL versionLocate the version information in the APROL installation - common locations: check the About dialog in the APROL system, look for a version file in the installation directory (version.txt, release.txt), or query the registry on Windows: reg query HKLM\SOFTWARE\BR\APROL /v VersionAffected if The installed version is earlier than R 4.4-01P5 (for example, R 4.2-xx, R 4.3-xx, or any build before the R 4.4-01P5 release)
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Check if SSL/TLS communications are enabledInspect APROL configuration files for SSL/TLS settings - typical config paths: look for ssl-enabled, use-ssl, tls-enabled, or similar flags in the APROL config directory (usually under config/ or etc/ subdirectories), or check the System Configuration > Communication settings within the APROL administration interfaceAffected if SSL/TLS communications are actively configured and in use within the APROL environment - if SSL/TLS is disabled entirely, the certificate validation flaw has no practical impact
You are affected if B&R APROL is installed with a version earlier than R 4.4-01P5 AND SSL/TLS communication features are enabled in the configuration.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade APROL to version R 4.4-01P5 or later to resolve the certificate validation flaw.
R 4.4-01P5 or later
- Identify the currently installed APROL version in your system
- Confirm the version is before R 4.4-01P5
- Review B&R Industrial Automation's official upgrade documentation for APROL
- Create a complete backup of the current APROL configuration and project data
- Schedule a maintenance window for the upgrade process
- Upgrade APROL to version R 4.4-01P5 or later following B&R's documented upgrade procedure
- After upgrade, verify that the certificate validation vulnerability is resolved by testing secure connections
- Confirm all dependent systems and integrations work correctly after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation6.0 h
- Implementation12.0 h
- Testing8.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-6900 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-6900 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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