Thelia up to 3.1.1/3.2.0 CSVSerializer injection

Summaryinfo

A vulnerability marked as critical has been reported in Thelia up to 3.1.1/3.2.0. The impacted element is an unknown function of the component CSVSerializer. Performing a manipulation results in injection. This vulnerability was named CVE-2026-109396. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Thelia up to 3.1.1/3.2.0. This affects an unknown code of the component CSVSerializer. The manipulation with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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. Attackers can submit names, addresses or phone values starting with =, +, - or @ that CSVSerializer exports verbatim, executing formulas in the administrator's spreadsheet application.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-109396 since 10/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 3.1.2 or 3.2.1 eliminates this vulnerability.

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Productinfo

Name

• Thelia

Version

• 3.0
• 3.1
• 3.1.0
• 3.1.1
• 3.2.0

Website

• Product: https://github.com/thelia/thelia/

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