CVE-2023-40756
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 · uneditedUser enumeration is found in PHPJabbers Callback Widget v1.0. This issue occurs during password recovery, where a difference in messages could allow an attacker to determine if the user is valid or not, enabling a brute force attack with valid users.
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 confidenceUser enumeration vulnerability in PHPJabbers Callback Widget v1.0 password recovery function. The application returns different error messages or responses for valid versus invalid usernames/emails during password recovery, allowing attackers to identify valid user accounts through systematic probing.
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= 1.0CVSS 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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Identify PHPJabbers Callback Widget installationLocate the web application files and check for callback-widget directory or similar PHPJabbers installation paths. Check version.php or configuration files for version number.Affected if The installed version is PHPJabbers Callback Widget version 1.0
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Verify password recovery functionality existsNavigate to the password recovery or forgot password page in the web interface. Look for forms accepting email or username input related to password reset.Affected if The password recovery form is accessible and accepts user input
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Test response for non-existent emailSubmit a fake or non-existent email address (e.g., [email protected]) to the password recovery form and capture the HTTP response or error message displayed.Affected if The application returns a specific error message indicating the email does not exist
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Test response for existing emailSubmit a known-valid email address (e.g., admin@localhost or a test account created during installation) to the password recovery form and capture the response.Affected if The application returns a different response (e.g., confirmation that email was sent) compared to the non-existent email test, confirming user enumeration is possible
A user is affected if PHPJabbers Callback Widget v1.0 is installed and the password recovery function returns distinguishable responses for valid versus invalid email addresses.
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 dataModify password recovery to return identical responses (e.g., 'If an account exists with this email, a recovery link has been sent') regardless of whether the submitted email/username exists in the system.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-40756 — 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-2023-40756 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
- No spam, self-promotion, credentials, or personal data