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Servers and applications

CVE-2011-5251

Open redirect vulnerability in forum/login.php in vBulletin 4.1.3 and earlier allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via the url parameter in a lostpw action.

Severity
Medium 5.8
Published
31 Dec 2012
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1.5% in the next 30 daysHigher than 75% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:N
Sources
NVD

Affected software

SoftwareAffected versions
vBulletinServers and applications · cpe:a:vbulletin:vbulletin
  • Version 4.1.2
  • Version 4.1.1
  • Version 4.1
  • Version 4.0.8
All 13 release lines
  • Every version up to 4.1.3
  • Version 4.0.0
  • Version 4.0.1
  • Version 4.0.2
  • Version 4.0.3
  • Version 4.0.4
  • Version 4.0.5
  • Version 4.0.6
  • Version 4.0.7
  • Version 4.0.8
  • Version 4.1
  • Version 4.1.1
  • Version 4.1.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-5251
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-5251