Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109396Thelia before 3.1.2 and 3.2.x before 3.2.1 CSV Formula Injection via Exports

Medium 4.2

In plain English

A medium-severity security flaw in Thelia from Thelia. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.2%top 85.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Thelia	Thelia	0 – before 3.1.23.2.0 – before 3.2.1

Weakness: CWE-1236 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-gcgv-f8rf-w2wc) vendor-advisory
https://github.com/thelia/thelia/commit/c00a26f0631ed9de3c4466176db6e808a25034aa patch
https://github.com/thelia/thelia/commit/6e46059225d87565caf4859ec0f764354e82ce95 patch
https://github.com/thelia/thelia/blob/3.2.0/core/lib/Thelia/Core/Serializer/Serializer/CSVSerializer.php technical-description
Thelia 3.1.2 Release Notes release-notes
Thelia 3.2.1 Release Notes release-notes
VulnCheck Advisory: Thelia before 3.1.2 and 3.2.x before 3.2.1 CSV Formula Injection via Exports third-party-advisory