CVE-2019-7849
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 · uneditedA defense-in-depth check was added to mitigate inadequate session validation handling by 3rd party checkout modules. This impacts Magento 1.x prior to 1.9.4.2, Magento Commerce prior to 1.14.4.2, Magento 2.1 prior to 2.1.18, Magento 2.2 prior to 2.2.9 and Magento 2.3 prior to 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 · high confidenceThis vulnerability involves inadequate session validation handling by third-party checkout modules in Magento e-commerce platforms. The fix adds a defense-in-depth check to properly validate sessions during checkout processes, potentially preventing session hijacking or manipulation attacks.
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< 1.14.4.2>= 1.0.0, < 1.9.4.2>= 2.1.0, < 2.1.18>= 2.2.0, < 2.2.9>= 2.3.0, < 2.3.2CVSS 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:3.0/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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Determine installed Magento versionCheck the version via the admin panel (System > Configuration > Advanced > Developer > Compile), or inspect the composer.json file in the Magento root directory, or run: php bin/magento --versionAffected if The installed version falls within any of these ranges: < 1.14.4.2 for Magento 1.14.x; >= 1.0.0 and < 1.9.4.2 for Magento 1.9.x; >= 2.1.0 and < 2.1.18 for Magento 2.1.x; >= 2.2.0 and < 2.2.9 for Magento 2.2.x; >= 2.3.0 and < 2.3.2 for Magento 2.3.x
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Identify third-party checkout modulesInspect the app/code directory for non-Magento checkout extensions, or review app/etc/config.php for enabled checkout modules, or check composer.json for third-party checkout package dependenciesAffected if Any third-party or community-developed checkout modules are installed and enabled in the Magento environment
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Verify session validation configurationReview the core_session and checkout session configuration in the admin panel under System > Configuration > Web > Session Validation Settings, and verify if session validation is properly enforcedAffected if Session validation settings are disabled or set to allow unauthenticated session access during checkout flows
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Check checkout session handlingExamine the checkout session model files in app/code/core/Mage/Checkout/Model/Session.php (Magento 1.x) or vendor/magento/module-checkout/Model/Session.php (Magento 2.x) for proper session validation callsAffected if The checkout session code lacks proper validate() or isValid() method calls before processing checkout data
A user is affected if their Magento installation version is below the fixed releases AND they have third-party checkout modules installed that do not implement proper session 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.
From vendor data1.9.4.21.14.4.22.1.18
Apply the available security patches by updating Magento to version 1.9.4.2/1.14.4.2 (Magento 1.x), 2.1.18 (Magento 2.1), 2.2.9 (Magento 2.2), or 2.3.2 (Magento 2.3) or later. Test all third-party checkout modules thoroughly after applying the update.
- Consultation2.0 h
- Implementation3.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-7849 — 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-2019-7849 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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