GHSA-gp6m-fq6h-cjcx Magento LTS vulnerable to stored XSS in admin file form

• Packagist openmage/magento-lts: >= 20.0.0, < 20.5.0 → fixed in 20.5.0 • Packagist openmage/magento-lts: < 19.5.3 → fixed in 19.5.3

Summary OpenMage is affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by a low-privileged attacker to inject malicious scripts into vulnerable form fields. Details `Mage_Adminhtml_Block_System_Config_Form_Field_File` does not escape filename value in certain situations. Same as: https://nvd.nist.gov/vuln/detail/CVE-2024-20717 PoC 1. Create empty file with this filename: `.crt` 2. Go to _System_ > _Configuration_ > _Sales | Payment Methonds_. 3. Click Configure on _PayPal Express Checkout_. 4. Choose API Certificate from dropdown _API Authentication Methods_. 5. Choose the XSS-file and click Save Config. 6. Profit, alerts "1" -> XSS. 7. Reload, alerts "1" -> Stored XSS. Impact Affects admins that have access to any fileupload field in admin in core or custom implementations. Malicious JavaScript may be executed in a victim’s browser when they browse to the page containing the vulnerable field.