CVE-2026-39573
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 · uneditedUnauthenticated PHP Object Injection in Mildhill <= 1.5 versions.
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 confidenceUnauthenticated PHP Object Injection vulnerability in Mildhill CMS/extension version 1.5 and below. Attackers can inject malicious PHP objects via unserialized user input without authentication, potentially leading to remote code execution or other attacks through PHP magic methods like __wakeup() or __destruct().
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
- High
CVSS:3.1/AV:N/AC:H/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.
-
Identify Mildhill CMS installationLocate the Mildhill CMS core files on the server - look for the main CMS directory or check installed extensions/plugins for MildhillAffected if Mildhill CMS or extension is present on the system
-
Determine installed versionCheck the version number of the Mildhill CMS or extension - typically found in a version file, composer.json, or the extension metadataAffected if The version is 1.5 or lower
-
Locate unserialize() calls in source codeSearch the Mildhill source code for unserialize() function calls, particularly in controller, model, or input processing filesAffected if Code contains unserialize() handling external or user-supplied input
-
Verify input source for deserializationTrace the data flow into unserialize() calls - examine if the input comes from $_GET, $_POST, $_REQUEST, cookies, or API parameters without prior validationAffected if User-controllable data is passed directly to unserialize() without sanitization
-
Check authentication requirementsReview the affected code paths to determine if authentication is required before the deserialization occursAffected if The vulnerable unserialize() call is reachable without authentication
The environment is affected if Mildhill CMS or extension version 1.5 or lower is installed and contains unserialize() calls processing unauthenticated user input.
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 · scopedReplace unsafe unserialize() calls with json_decode() for handling user input, or implement strict allowlist validation if deserialization is required. Upgrade to a patched version if available.
Latest version of Mildhill plugin (after 1.5) - check WordPress plugin repository for current release
- Update the Mildhill plugin to the latest available version from the WordPress plugin repository
- If automatic updates are enabled, verify the update has been applied
- Confirm the site is running the patched version by checking the plugin version number
- Review site for any suspicious admin accounts or unexpected files that may have been created via the PHP Object Injection
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39573 — 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-2026-39573 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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
- No spam, self-promotion, credentials, or personal data