---
id: CVE-2026-109396
title: >-
  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
summary: >-
  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…
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-1236
published: '2026-10-12'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:41:35.943'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109396'
references:
  - url: >-
      https://github.com/thelia/thelia/blob/3.2.0/core/lib/Thelia/Core/Serializer/Serializer/CSVSerializer.php
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/thelia/thelia/commit/6e46059225d87565caf4859ec0f764354e82ce95
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/thelia/thelia/commit/c00a26f0631ed9de3c4466176db6e808a25034aa
    label: disclosure@vulncheck.com
  - url: 'https://github.com/thelia/thelia/releases/tag/3.1.2'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/thelia/thelia/releases/tag/3.2.1'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/thelia-before-3.1.2-and-3.2-x-before-3.2.1-csv-formula-injection-via-exports
    label: disclosure@vulncheck.com
  - url: 'https://github.com/thelia/thelia/security/advisories/GHSA-gcgv-f8rf-w2wc'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00232
epssPercentile: 0.14014
ingestedAt: '2026-10-12T16:57:59.914Z'
vendor: Thelia
product: Thelia
affected:
  - Thelia < 3.1.2
  - Thelia >= 3.2.0 < 3.2.1
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T15:21:28.032308Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.