EUVD-2026-70415
GHSA-ffqf-m6vh-866w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible IPN endpoint, no auth or complexity; pure integrity impact (order fraud), no confidentiality or availability effect.
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
Lifecycle Timeline
3DescriptionCVE.org
Joomla Extension - j2commerce.com - Unauthenticated PayPal callback forgery leading to order confirmation fraud in J2Store 1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6 - The PayPal IPN listener's signature check (_validateIPN()) accepted UNVERIFIED and any non-INVALID response as valid, made its verification request with CURLOPT_SSL_VERIFYPEER disabled, and stored its verdict in a field nothing downstream ever checked - so processing continued regardless of the outcome. Separately, the paid-amount comparison only ran when mc_gross was a positive number; omitting the field from the POST body (floatval(null) == 0) skipped the check entirely. Combined with a merchant-configured receiver_email and a sequential, enumerable order id read from the custom field, an anonymous POST was enough to move a pending order straight to CONFIRMED with no payment, or force another customer's pending order to FAILED. paypalv2.php performed no amount check under any circumstances.
AnalysisAI
Unauthenticated PayPal IPN callback forgery in J2Store (Joomla e-commerce extension) versions 1.0.0-3.3.21, 4.0.0-4.0.21, and 4.1.0-4.1.6 allows any anonymous attacker to confirm orders without payment or force other customers' orders to FAILED status. The vulnerability stems from three compounding flaws: a signature verification function that treated UNVERIFIED as acceptable, disabled TLS peer verification on the outbound PayPal check, and amount validation that could be entirely bypassed by omitting the mc_gross field - making the IPN endpoint trivially forgeable with a plain unauthenticated HTTP POST. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The PayPal IPN listener endpoint must be enabled - this is required for any PayPal-integrated J2Store installation using IPN, which is the default PayPal integration mode. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is high for any merchant running a vulnerable J2Store version with PayPal IPN enabled. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade J2Store to a version beyond the affected ranges: above 3.3.21 for the 3.x branch, above 4.0.21 for the 4.0.x branch, or above 4.1.6 for the 4.1.x branch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running J2Store and determine whether they are on affected versions (1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6); immediately disable public access to the IPN callback endpoint or restrict it to PayPal-authorized IP addresses via firewall rules. …
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