CVE-2026-103527

Thelia before 3.1.1 contains a stored cross-site scripting vulnerability that allows authenticated back-office administrators with store update permission to inject scripts by uploading unsanitized SVG logo_file or banner_file images. An SVG with an onload payload served from /admin/store-media/logo or the public cache/images/store/ directory can execute scripts against visitors and higher-privileged administrators.

Thelia before 3.2.0 contains a cross-site request forgery vulnerability in the back office that allows attackers to forge administrative actions because per-session CSRF tokens leak via URL query strings. Attackers can reuse leaked tokens or target the unprotected setToggleVisibilityAction and updatePositionAction to make logged-in administrators delete, hide or reorder catalogue and configuration objects.

Thelia before 3.1.0 contains a stored cross-site scripting vulnerability in ForSomeCustomers::getSummary() that allows unauthenticated attackers to inject scripts via unescaped customer names. Attackers can register with a script payload as their name that executes when administrators view related coupons, stealing CSRF tokens to create administrator accounts.

Thelia before 3.1.5 and 3.2.x before 3.2.4 contains a business logic vulnerability that allows authenticated customers to bypass coupon usage limits because usage is counted only when orders become paid. Attackers can place multiple pay-later orders while a usage remains, or cancel paid orders to inflate max_usage, gaining unlimited discounts.

Thelia before 3.1.2 and 3.2.x before 3.2.1 contains an unrestricted file upload vulnerability that allows authenticated back-office users to upload PHP files by appending a trailing space to filenames. FileProcessorService validates the raw filename but FileManager::sanitizeFileName() strips the space, storing an executable .php file under public/cache/documents/ for code execution as the web server user.

Thelia before 3.1.2 and 3.2.x before 3.2.1 contains a CSV formula injection vulnerability that allows unauthenticated visitors to inject spreadsheet formulas by supplying crafted registration, checkout or newsletter fields.

Thelia 3.0.0's back-office Email/Messages feature contains a server-side template injection (SSTI) flaw allowing any authenticated user with 'Messages' permission to supply unsandboxed Twig templates, executed as raw code. Can lead to full compromise of application and host.

Thelia 2.6.1 contains an absolute path traversal vulnerability in its Smarty template handling that enables SSTI and remote code execution. The checkTemplate() validation restricts relative directory traversal sequences but does not reject absolute paths, allowing an authorized user to supply an arbitrary filesystem path as a template. Smarty then loads and compiles the referenced file without an effective security policy, so depending on filesystem layout and deployment configuration, template code in the file can be executed with the web server's privileges.

Thelia v2.6.1 contains path traversal and PHP code injection vulnerabilities in its translation editor that can be chained to achieve remote code execution. The item_name parameter does not sanitize directory traversal sequences, allowing an authenticated user with UPDATE-level permissions to write files outside the expected templates directory, including web-accessible paths. Additionally, the translation-writing logic does not escape backslashes, allowing inputs to break out of PHP string literals and inject executable code. Chained together, these flaws allow a malicious PHP file to be written to a web-accessible path and executed with web-server privileges.

Thelia v2.6.0 permits authenticated administrators to upload and install modules via the ZIP upload function without validating or sandboxing embedded PHP code. An attacker can include malicious PHP code in a module's install() method which will then be executed upon installation, enabling remote code execution with the privileges of the web server.