CVE-2026-109397 Thelia before 3.1.2 and 3.2.x before 3.2.1 File Upload RCE via Filename Trailing Space
Authenticated back-office users can upload PHP files by appending trailing spaces to filenames, leading to remote code execution on the web server.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109397?
CVE-2026-109397 is a high-severity vulnerability in Thelia, published on 12 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Thelia before 3.1.2 and 3.2.x before 3.2.1 contains an unrestricted file upload vulnerability that allows authenticated back-office users to upload PHP files by appending a trailing space to filenames. FileProcessorService validates the raw filename but FileManager::sanitizeFileName() strips the space, storing an executable .php file under public/cache/documents/ for code execution as the web server user.
Weakness: CWE-434
Which versions are affected by CVE-2026-109397?
How do I fix CVE-2026-109397?
No fix has been published for CVE-2026-109397 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109397 being exploited?
There is no known exploitation of CVE-2026-109397 in the wild and no public exploit code.
Sources
Also known as GHSA-5524-qfxp-33v9, GHSA-hjxm-gpw4-w4q7.