Paessler PRTG Network Monitor before 25.4.114 allows XSS by an unauthenticated attacker via the tag parameter.

published 2026-01-14 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-2435

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits: 0; none known

Patch / fix

fixed in 1

paessler prtg_network_monitor 25.4.114.1032

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-01-14)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

helpdesk.paessler.com /en/support/solutions/articles/76000087289-vulnerabilities-in-prtg-prior-v25-4-114-1032
vendor-advisory
paessler.com
product

Sources

CVE List CVE-2025-67833
NVD CVE-2025-67833

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