Potential XSS in Extension:BlueSpiceWhoIsOnline

published 2025-09-19 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-30286

cvss: 5.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

Improper Encoding or Escaping of Output vulnerability in Hallo Welt! GmbH BlueSpice (Extension:BlueSpiceWhoIsOnline) allows Cross-Site Scripting (XSS). This issue affects BlueSpice: from 5 through 5.1.1.

Patch / fix

fixed in 1

hallowelt bluespice 5.1.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 13 mo ago (2025-09-19)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.9	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA	4.0	5.9	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

Hallo Welt! GmbH BlueSpice

Classification

Weakness

CWE-116 Improper Encoding or Escaping of Output
CWE-79 Improper Neutralization of Input During Web Page Generation

References

en.wiki.bluespice.com /wiki/Security:Security_Advisories/BSSA-2025-05
vendor-advisory

Sources

CVE List CVE-2025-57880
NVD CVE-2025-57880

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