Thelia up to 2.6.1 Translation Editor item_name path traversal

Summaryinfo

A vulnerability categorized as problematic has been discovered in Thelia up to 2.6.1. Affected by this issue is some unknown functionality of the component Translation Editor. Executing a manipulation of the argument item_name can lead to path traversal. This vulnerability is handled as CVE-2026-103535. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Thelia up to 2.6.1 and classified as problematic. This vulnerability affects an unknown functionality of the component Translation Editor. The manipulation of the argument item_name with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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, used to build the translation file's write path, does not sanitize directory traversal sequences such as `../`. This enables an authenticated user with `UPDATE`-level permissions on `admin.configuration.language` to write files outside the expected `templates/` directory, including to web‑accessible paths. Separately, the translation‑writing logic does not escape `\` in user‑supplied values, allowing inputs to break out of the PHP string literal and inject executable code into the translation file. Chained together, these flaws allow a malicious PHP file to be written to a web-accessible path and executed with the web‑server’s privileges.

The advisory is shared for download at kb.cert.org. This vulnerability was named CVE-2026-103535 since 09/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/12/2026). The MITRE ATT&CK project declares the attack technique as T1006.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Thelia

Version

• 2.6.0
• 2.6.1

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CPE 2.2info

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