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CVE-2003-0521

Cross-site scripting (XSS) vulnerability in cPanel 6.4.2 allows remote attackers to insert arbitrary HTML and possibly gain cPanel administrator privileges via script in a URL that is logged but not properly quoted when displayed via the (1) Error Log or (2) Latest Visitors screens.

Severity
Medium 6.8
Published
18 Aug 2003
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1.6% in the next 30 daysHigher than 76% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
cPanel & WHMServers and applications · cpe:a:cpanel:cpanel
  • Version 6.4.2_stable_48
  • Version 6.4.2
  • Version 6.4.1
  • Version 6.4
All 8 release lines
  • Version 5.0
  • Version 5.3
  • Version 6.0
  • Version 6.2
  • Version 6.4
  • Version 6.4.1
  • Version 6.4.2
  • Version 6.4.2_stable_48

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2003-0521
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2003-0521