CVE-2021-26631
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 · uneditedImproper input validation vulnerability in Mangboard commerce package could lead to occur for abnormal request. A remote attacker can exploit this vulnerability to manipulate the total order amount into a negative number and then pay for the order.
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 confidenceMangboard commerce package has an improper input validation vulnerability that allows remote attackers to manipulate the order total amount to a negative value. This occurs because the application does not validate that monetary values are positive before processing payment, enabling attackers to submit negative order amounts and effectively pay for orders with manipulated values.
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< 1.3.9CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 if Mangboard Commerce is installedCheck your web application directory for the Mangboard Commerce package or plugin files. Look for directories or files named 'mangboard' or 'commerce' that are part of the Mangboard system.Affected if Mangboard Commerce package is found in the environment
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Determine the installed version of Mangboard CommerceLocate the version file, manifest, or header comments within the Mangboard Commerce installation. Common locations include a version.php file, composer.json, or the main plugin/theme header. Compare the version number against the vulnerable range: < 1.3.9Affected if The installed version is lower than 1.3.9
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Verify the commerce module is enabledCheck the Mangboard configuration or settings panel to confirm the Commerce package/module is actively enabled. Look for settings related to orders, payments, or e-commerce functionality.Affected if Commerce module is enabled and processing orders
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Inspect order submission handling for amount validationExamine the server-side code that handles order total amount submissions. Look for the payment processing script that accepts the order total parameter and verify whether it checks that the amount is a positive numeric value before processing.Affected if Code allows submission of negative or non-positive order amounts without validation
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Review payment processing logic for business rule checksLocate the payment processing function that calculates or receives the order total. Check if there are any server-side checks that reject transactions where the total amount is less than or equal to zero before communicating with the payment gateway.Affected if Payment processing accepts and attempts to process negative or zero amounts
A user is affected if Mangboard Commerce version lower than 1.3.9 is installed with the commerce module enabled and the order amount fields accept negative values without server-side validation.
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 · scoped1.3.9
Implement server-side input validation to ensure all order amount fields contain only positive numeric values, and add business logic checks to reject any transaction where the total amount is less than or equal to zero before processing.
Mangboard Commerce package version 1.3.9 or later
- Identify all Mangboard installations using the Commerce package in your environment
- Check the current version of the Mangboard Commerce package (typically found in package configuration or admin panel)
- If the version is below 1.3.9, download the Mangboard Commerce package version 1.3.9 or later from the official vendor
- Backup your current database and application files before proceeding with the upgrade
- Install the updated Commerce package following the vendor's upgrade documentation
- Verify that the new version is correctly installed and the application functions normally
- Test the order payment flow to confirm the input validation properly prevents negative order amounts
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation6.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-26631 — 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-2021-26631 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
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