CVE-2025-53839 DRACOON Branding Service vulnerable to Cross-site Scripting
Administrative users can inject HTML into the onboarding workflow, potentially compromising newly onboarded users in DRACOON.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-53839?
CVE-2025-53839 is a medium-severity cross-site scripting vulnerability in dracoon security-advisories, published on 14 Jul 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
DRACOON is a file sharing service, and the DRACOON Branding Service allows customers to customize their DRACOON interface with their brand. Versions of the DRACOON Branding Service prior to 2.10.0 are vulnerable to cross-site scripting. Improper neutralization of input from administrative users could inject HTML code into the workflow for newly onboarded users. A fix was made available in version 2.10.0 and rolled out to the DRACOON service. DRACOON customers do not need to take action.
Weakness: CWE-79
Which versions are affected by CVE-2025-53839?
How do I fix CVE-2025-53839?
No fix has been published for CVE-2025-53839 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-2025-53839 being exploited?
There is no known exploitation of CVE-2025-53839 in the wild and no public exploit code.