CVE-2026-51833

Xenforo 2.3.8 is vulnerable to SSRF. Attackers that have administrator privileges or are able to add/save RSS feeds can enumerate internal services (ports) or expose the original IP address of the server.

We have discovered 651 live websites that are affected by CVE-2026-51833.

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Affected Software

Product  XenForo
Category Message Boards
Vulnerable Domains651 live websites (100% of XenForo install base)
Vulnerable Versions
  • from 0 through 2.3.8
Vulnerable Versions Count26 versions ( 100% of all versions)



Details

  • Published - Jul 17, 2026
  • Updated - Jul 20, 2026

Website Distribution by Country

Number of websites using CVE-2026-51833
United States363 websites


Russia144 websites
GB32 websites
Germany30 websites
Singapore13 websites
France11 websites
Netherlands8 websites
Canada6 websites
Turkey6 websites
Finland5 websites

Website Distribution by TLD

Number of websites using CVE-2026-51833
.com325 websites
.ru141 websites
.net53 websites
.org36 websites
.co.uk20 websites
.de17 websites
.ca5 websites
.co5 websites
.nl4 websites
.se3 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-51833

Top websites that are affected by CVE-2026-51833. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
*************.com United States**,***
****************.com United States***,***
****************.com United States***,***
*******.com United States***,***
******.com United States***,***
*****.******.com United States***,***
**********.com United States***,***
***********.com United States***,***
**************.com United States***,***
**********.net United States***,***
See full domain list

FAQ

A total of 651 websites have been identified as vulnerable to CVE-2026-51833, based on global website indexing conducted by WebTechSurvey.
The XenForo is affected by the CVE-2026-51833 vulnerability.
XenForo versions up to and including 2.3.8 are vulnerable to CVE-2026-51833.