CRITICAL

CVE-2019-18839

CVSS v3

CRITICAL

EPSS Score

5.4 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2019-18839 yet.

Full record on NVD

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.

Technical details

Published: 2019-11-13

Frequently asked questions

What is CVE-2019-18839?

Is CVE-2019-18839 actively exploited?

Active exploitation of CVE-2019-18839 has not been confirmed. Its EPSS score was 5.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-18839?

CVE-2019-18839 has a CVSS v3 base score of 9 (CRITICAL severity).

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