CVE-2023-51630: Paessler PRTG Network Monitor Cross-Site Scripting Authentication Bypass Vulnerability

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-08 · updated 2026-06-17
Weakness: CWE-79

Description

Paessler PRTG Network Monitor Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Paessler PRTG Network Monitor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the web console. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this vulnerability to bypass authentication on the system. . Was ZDI-CAN-21182.

Affected products

Paessler PRTG: before 24.1.90.1306 — fixed in 24.1.90.1306

How to fix

Upgrade to a fixed version: Paessler PRTG 24.1.90.1306. Check the vendor advisory for mitigations.

References

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