CVE-2026-109396 Thelia before 3.1.2 and 3.2.x before 3.2.1 CSV Formula Injection via Exports
Unauthenticated attackers can inject malicious spreadsheet formulas into CSV exports, potentially executing code on the administrator's machine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109396?
CVE-2026-109396 is a low-severity vulnerability in Thelia, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-1236
Which versions are affected by CVE-2026-109396?
How do I fix CVE-2026-109396?
No fix has been published for CVE-2026-109396 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109396 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109396 exists.
Sources
Also known as GHSA-gcgv-f8rf-w2wc, GHSA-w4v5-q3gm-mcf9.