What’s Vulnerable › Vulnerabilities

CVE-2019-18873

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-11-12 · updated 2026-06-17
• Weakness: CWE-78

Description

FUDForum 3.0.9 is vulnerable to Stored XSS via the User-Agent HTTP header. This may result in remote code execution. An attacker can use a user account to fully compromise the system via a GET request. When the admin visits user information under "User Manager" in the control panel, 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. The problem is in admsession.php and admuser.php.

Affected products

• Fudforum: 3.0.9

References

• https://github.com/fuzzlove/FUDforum-XSS-RCE
• https://sourceforge.net/p/fudforum/code/6321/
• https://github.com/fuzzlove/FUDforum-XSS-RCE
• https://sourceforge.net/p/fudforum/code/6321/

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