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CVE-2019-18839

9.0 · CRITICAL

FUDForum 3.0.9 is vulnerable to Stored XSS via the nlogin parameter.

Published Nov 13, 2019CWE-78EPSS 5.44%

Overview

CVE-2019-18839 is a critical-severity vulnerability. It was published on November 13, 2019 and has a CVSS 3.1 base score of 9.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.0, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

FUDForum 3.0.9 is vulnerable to Stored XSS via the nlogin parameter. This may result in remote code execution. An attacker can use a user account to fully compromise the system using a POST request. When the admin visits the user information, the payload will execute. This will allow for PHP files to be written to the web root, and for code to execute on the remote server.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/fuzzlove/FUDforum-XSS-RCERefpacketstormsecurity.com/files/155261/FUDForum-3.0.9-Code-Execution-Cross-Site-Scripting.htmlGitHubgithub.com/fuzzlove/FUDforum-XSS-RCERefpacketstormsecurity.com/files/155261/FUDForum-3.0.9-Code-Execution-Cross-Site-Scripting.html

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18839?

CVE-2019-18839 is a critical-severity vulnerability. It was published on November 13, 2019 and has a CVSS 3.1 base score of 9.0 (CRITICAL).

How severe is CVE-2019-18839?

This vulnerability has a CVSS 3.1 base score of 9.0, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-18839?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-18839?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18839 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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