CVE-2026-73320 PUBLISHED

XenForo < 2.3.13 Unauthenticated Information Disclosure via Unfurl Endpoint

Assigner: VulnCheck
Reserved: 11.08.2026 Published: 08.09.2026 Updated: 09.09.2026

XenForo before 2.3.13 contains an unauthenticated information disclosure vulnerability that allows unauthenticated attackers to retrieve private unfurl records by supplying predictable auto-increment primary key IDs to the unfurl endpoint. Attackers can enumerate or predict result IDs and query the endpoint without any session, user, or visibility checks to obtain rendered preview HTML, original URLs, and query strings from private conversations and other restricted content.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS Score: 5.1

Product Status

Vendor XenForo
Product XenForo
Versions Default: unaffected
  • affected from 0 to 2.3.13 (excl.)

Credits

  • Marco Paciaroni (BomboBombone) finder
  • VulnCheck coordinator

References

Problem Types

  • Authorization Bypass Through User-Controlled Key CWE