CVE WatchSep 24, 2026

CVE-2026-4637

Paessler PRTG Network Monitor before version 26.2.120.1449 is affected by a reflected Cross-Site Scripting (XSS) vulnerability. When a reque

CVSS

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No CVSS

EPSS

0.6%

p45

KEV

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Exploit Today

0-100

Published: Sep 24, 2026 · Last modified: Sep 24, 2026 · CWE-79

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-09-252026-10-20

Technical description

Paessler PRTG Network Monitor before version 26.2.120.1449 is affected by a reflected Cross-Site Scripting (XSS) vulnerability. When a request is made for a non-existent resource ending in \".htm\", the web interface returns an HTTP 403 \"Forbidden Path\" error page that echoes the requested URL path into the HTML response body without proper output encoding or sanitization. An unauthenticated, remote attacker can craft a URL containing an HTML/JavaScript payload in the path (e.g. https:////welcome.htm) and, once a victim with an active PRTG session opens the crafted link, execute arbitrary JavaScript in the security context of the PRTG web interface. Because the PRTG session cookie is not protected with the HttpOnly attribute, successful exploitation allows the attacker to read and exfiltrate the victim's session cookie, potentially leading to session hijacking.

Official references

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CVECVSSEPSSKEVRExploitTitleMod.

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