CVE-2026-77999
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
Description
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.
Sévérité
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
Score retenu : NVD
| Source | Sévérité d'origine | CVSS |
|---|---|---|
| NVD | HIGH | 8.7 (v4.0) |
Produit et versions
- Produit
- Extension Joomla — j2commerce.com
- Corrigée dans
- Non précisée
- Publiée
- 03/09/2026
- Modifiée
- 03/09/2026
- CWE
- CWE-472, CWE-602
Versions concernées
- J2Store extension for Joomla — 1.0.0 – 3.3.21
- J2Store extension for Joomla — 4.0.0 – 4.0.21
- J2Store extension for Joomla — 4.1.0 – 4.1.6
Sources
- NVD CNA Joomla CVE-2026-77999 vu
Ces informations proviennent des sources ci-dessus ; CVE Oyer n'y ajoute aucune interprétation.
Historique
- Détectée via nvd26/09/2026 09:34 UTC