DRACOON Branding Service vulnerable to Cross-site Scripting

published 2025-07-14 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-21397

cvss: 4.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 15 mo ago (2025-07-15)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.0	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected products

dracoon security-advisories

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /dracoon/security-advisories/security/advisories/GHSA-jv2h-8mw7-mc97

Sources

CVE List CVE-2025-53839
NVD CVE-2025-53839

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary