Thelia up to 2.6.0 Document Update Endpoint unrestricted upload

Summaryinfo

A vulnerability identified as problematic has been detected in Thelia up to 2.6.0. This affects an unknown part of the component Document Update Endpoint. The manipulation leads to unrestricted upload. This vulnerability is uniquely identified as CVE-2026-103521. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Thelia up to 2.6.0 and classified as problematic. This issue affects some unknown functionality of the component Document Update Endpoint. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In Thelia v2.6.0, the document upload endpoint properly blocks the upload of executable file types, but the document update endpoint does not perform the same validation. An attacker with administrative Thelia permissions can exploit this vulnerability to upload arbitrary executable files, such as malicious PHP scripts, to achieve remote code execution on the underlying server.

The advisory is shared at kb.cert.org. The identification of this vulnerability is CVE-2026-103521 since 09/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/12/2026). MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

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

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Productinfo

Name

• Thelia

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6.0

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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