CVE-2026-49865 Kimai has Server-Side Request Forgery in Invoice PDF Rendering via Markdown Image URLs
Attackers can force the Kimai server to make arbitrary HTTP requests via Markdown image URLs in invoice PDFs, enabling internal network probing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49865?
CVE-2026-49865 is a medium-severity server-side request forgery vulnerability in kimai, published on 11 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Kimai is an open-source time tracking application. Versions prior to 2.58.0 contain a server-side request forgery vulnerability in their invoice PDF preview and generation workflow. If an attacker can control Markdown content that is later rendered into an invoice PDF, such as `Customer.invoiceText`, the server-side PDF renderer will fetch remote image URLs embedded in Markdown image syntax. This allows the application server to issue outbound requests to attacker-controlled or internal targets during PDF rendering. The behavior can be used for internal network probing, server-side reachability checks, and potentially follow-on exploitation depending on deployment environment and accessible internal services. Version 2.58.0 patches the issue.
Weakness: CWE-918
Which versions are affected by CVE-2026-49865?
2 open source packages ship an affected version, including kimai/kimai.
| Package | Affected | Fixed in |
|---|---|---|
kimai/kimai Packagist | All versions | 2.58.0 |
kimai/kimai Packagist | All versions | 2.58.0 |
How do I fix CVE-2026-49865?
Upgrade kimai/kimai to 2.58.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-49865 being exploited?
There is no known exploitation of CVE-2026-49865 in the wild and no public exploit code.
Sources
Also known as GHSA-pj8j-p4g4-4vw8.