THREATPORT/VULNERABILITY/CVE-2019-18873
CRITICAL SEVERITY

CVE-2019-18873

Fudforum vulnerability

CVSS
9.0
EPSS
8.2%
EPSS pct
94th
Exploited
No known
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 vendor
Fudforum
Affected product
Fudforum
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-78 — OS Command Injection
  • CWE-79 — Cross-Site Scripting (XSS)
Published
2019-11-12

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 8.2% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2019-18873

  • Confirm whether Fudforum Fudforum is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-18873.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-18873

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-18873 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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