CVE-2026-56021
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 · uneditedWebmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.
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 confidenceWebmin contains an unauthenticated file disclosure vulnerability allowing attackers to read files ending in .conf within module directories. The vulnerability exists due to a bypassable regex pattern that fails to properly restrict file access paths.
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 data< 1.290CVSS 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
- Low
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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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Confirm Webmin installation and versionIdentify if Webmin is installed on the system and determine the installed version through package manager, Webmin's system information page, or version file in the Webmin installation directoryAffected if Webmin is installed and the version falls within the affected range (compare to vendor-provided affected version list)
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Verify Webmin web interface accessibilityCheck if the Webmin web interface (typically port 10000 or configured SSL port) is accessible from network segments that are not trusted or should not have administrative accessAffected if The Webmin administrative interface is exposed to untrusted networks without additional authentication barriers
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Identify unauthenticated file access endpointsReview Webmin's configuration and enabled modules to determine if any file viewing or configuration reading features can be accessed without authenticationAffected if Unauthenticated access is permitted to features that allow reading files, particularly .conf files within module directories
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Check module directory configurationExamine Webmin module configurations to identify if any modules expose .conf file reading functionality and whether these can be accessed without authenticationAffected if Modules with .conf file access capabilities are accessible to unauthenticated users through the bypassable regex pattern
A user is affected if Webmin is running and its file reading features for .conf files in module directories are accessible to unauthenticated users via the vulnerable regex bypass.
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 data1.290
Restrict network access to Webmin administrative interfaces, implement additional authentication layers, and apply vendor-provided patches when released to address the regex bypass.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,888.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-56021 — 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-2026-56021 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
- No weaponised exploit code, or anything meant to cause harm
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