CVE-2026-72559 Daniel Brendel HortusFox - Cross-Site Scripting
Authenticated users can inject persistent JavaScript into plant notes, enabling session theft and administrative actions against other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-72559?
CVE-2026-72559 is a medium-severity cross-site scripting vulnerability in Daniel Brendel HortusFox, published on 11 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A stored cross-site scripting vulnerability in HortusFox 5.9 allows authenticated workspace members to inject persistent JavaScript into plant notes via Parsedown rendered without safe mode. Notes are rendered unescaped in the browser of every user who views the affected plant. An attacker can use this to steal session cookies or perform actions in the context of other users including administrators.
Weakness: CWE-79
Which versions are affected by CVE-2026-72559?
How do I fix CVE-2026-72559?
No fix has been published for CVE-2026-72559 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-72559 being exploited?
There is no known exploitation of CVE-2026-72559 in the wild and no public exploit code.
Sources
Also known as GHSA-3fwq-xc2g-q79x.