CVE-2026-35556
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 a Plaintext Storage of a Password vulnerability that could allow an attacker to retrieve credentials and access sensitive information.
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 · high confidenceOpenPLC_V3 stores user passwords in plaintext rather than using cryptographic hashing. An attacker who gains access to the password storage (e.g., through database compromise, file access, or backup exposure) can retrieve valid credentials in readable form and use them to authenticate as compromised users.
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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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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Identify OpenPLC V3 installationLocate the OpenPLC V3 installation directory or firmware and confirm the version matches the affected product (Openplcproject Openplc V3 Firmware)Affected if OpenPLC V3 is installed and running
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Locate user credential storageSearch for database files, configuration files, or user record files used by OpenPLC V3 for storing user account information. Common locations include the webserver directory, data folder, or SQLite database files.Affected if User credential storage files exist in the OpenPLC installation
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Inspect password storage formatOpen the identified credential storage file and examine how passwords are stored for user accounts. Look for whether passwords appear as readable text strings or as cryptographic hash outputs.Affected if Passwords appear as plaintext readable strings rather than hashed values like $2a$, $scrypt$, or $argon2$
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Verify password hashing implementationIf a source code or configuration is accessible, check the authentication module for the password storage function. Look for whether the code uses hashing libraries (bcrypt, scrypt, Argon2) or stores passwords directly without transformation.Affected if Code stores passwords verbatim without applying any hashing algorithm
If OpenPLC V3 is running and passwords in the user storage are stored as plaintext readable strings rather than hashed values, the environment is affected by CVE-2026-35556.
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 dataImplement proper password hashing using a modern algorithm like bcrypt, scrypt, or Argon2, with unique per-password salts. Existing plaintext passwords must be migrated to the new hashed format, and the application must be updated to hash new passwords at creation/change time rather than storing them verbatim.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-35556 — 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-2026-35556 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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