CVE-2026-103537 CVE-2026-103537
An authorized user can exploit absolute path traversal in Thelia's template handling to achieve remote code execution via Server-Side Template Injection.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103537?
CVE-2026-103537 is a medium-severity code injection vulnerability in Thelia, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Thelia 2.6.1 contains an absolute path traversal vulnerability in its Smarty template handling that enables SSTI and remote code execution. The `checkTemplate()` validation restricts relative directory traversal sequences such as `../` but does not reject absolute paths, allowing an authorized user to supply an arbitrary filesystem path as a template. Smarty then loads and compiles the referenced file without an effective security policy, so depending on filesystem layout and deployment configuration, template code in the file can be executed with the web server's privileges.
Which versions are affected by CVE-2026-103537?
How do I fix CVE-2026-103537?
No fix has been published for CVE-2026-103537 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-103537 being exploited?
There is no known exploitation of CVE-2026-103537 in the wild and no public exploit code.
Sources
Also known as GHSA-q9cq-f2v7-j486.