CVE-2025-49393
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 · uneditedDeserialization of Untrusted Data vulnerability in Fetch Designs Sign-up Sheets sign-up-sheets allows Object Injection.This issue affects Sign-up Sheets: from n/a through <= 2.3.2.
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 confidenceThis is a PHP Object Injection vulnerability in the Fetch Designs Sign-up Sheets WordPress plugin. The plugin deserializes untrusted data without proper validation, allowing authenticated or unauthenticated attackers to inject malicious PHP objects. When paired with magic methods in the plugin or other installed plugins, this can lead to remote code execution.
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
- 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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Check installed plugin versionIn WordPress admin, go to Plugins > Installed Plugins > Sign-up Sheets, or inspect the plugin main file header for 'Version:' value. Alternatively, check wp-content/plugins/sign-up-sheets/readme.txt for the Stable tag.Affected if version is lower than 2.3.3 or the version cannot be determined (unknown)
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Verify plugin is activeConfirm the Sign-up Sheets plugin is enabled in WordPress (Plugins > Installed Plugins). Check the wp_options table for 'active_plugins' option containing 'sign-up-sheets'.Affected if plugin is installed and active
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Identify deserialization usage in plugin codeSearch plugin source files for 'unserialize()' function calls, particularly in files handling form submissions, AJAX requests, or AJAX callbacks within wp-content/plugins/sign-up-sheets/.Affected if unserialize() calls exist in the plugin code processing user input
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Check for untrusted data deserializationExamine the plugin files identified in step 3 to see if unserialize() is called on data from $_POST, $_GET, $_REQUEST, or database values that could be controlled by users.Affected if unserialize() processes any input originating from user requests or external sources
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Inspect plugin entry points for unauthenticated accessReview plugin AJAX handlers and public-facing forms to determine if they can be accessed without authentication. Check for 'nopriv' capability in add_action calls or absence of auth checks.Affected if plugin endpoints accepting user data are accessible without authentication
The environment is affected if the Sign-up Sheets plugin version is below 2.3.3 AND the plugin contains unserialize() calls that process untrusted user input, especially via unauthenticated endpoints.
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 dataUpgrade to a patched version of the Sign-up Sheets plugin (version 2.3.3 or higher). Until a patch is available, disable the plugin or implement WAF rules to block deserialization-related attack patterns.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-49393 — 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-2025-49393 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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