RCE in Fudforum
CVE-2019-18839
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.054 (91.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Fudforum — versions 3.0.9
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2019-18839?
- CVE-2019-18839 is a critical-severity vulnerability in Fudforum, classified under OS Command Injection. CVSS score: 9.0/10. Published 2019-11-13.
- How severe is CVE-2019-18839?
- Critical severity. CVSS v3 base score is 9.0 out of 10.
- Is CVE-2019-18839 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.