CVE-2026-28205
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 · uneditedOpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an attacker to gain access to the system by bypassing authentication via an API.
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 confidenceOpenPLC_V3 contains an insecure default initialization in its API authentication mechanism that allows unauthenticated attackers to bypass login controls and access the system. The vulnerability stems from a resource (likely a default account, token, or API key) being configured with an insecure default value at initialization time.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS 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
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Confirm OpenPLC V3 is runningIdentify the OpenPLC V3 service or process on the system, typically via process list or service status commandAffected if OpenPLC V3 firmware is actively running on the system
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Locate API authentication configurationFind the configuration file or settings that control API authentication for OpenPLC V3, typically in the web server or application config directoryAffected if Configuration file exists and contains authentication settings
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Inspect default authentication settingsExamine the authentication configuration for default, insecure, or weak settings - particularly looking for whether default credentials or unauthenticated access is enabledAffected if Default insecure authentication settings are in use rather than custom secure configuration
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Test API endpoint access without credentialsSend a crafted API request to the OpenPLC V3 web interface or API endpoint without providing authentication credentialsAffected if API request succeeds or returns valid data without requiring authentication
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Verify resource initialization settingsReview system or application initialization files and settings that control resource access and authentication at startupAffected if Insecure default resource initialization is detected that bypasses authentication checks
If OpenPLC V3 is running with default or insecure authentication configuration, or if API requests can be processed without valid credentials, the system is affected by this authentication bypass vulnerability.
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.
From vendor dataConfigure strong, unique authentication credentials for all API endpoints and ensure proper initialization of authentication resources. Disable any default accounts or tokens that may exist, and implement proper authentication flow validation.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-28205 — 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-2026-28205 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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