Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-73320

CVE-2026-73320MEDIUM

XenForo < 2.3.13 Unauthenticated Information Disclosure via Unfurl Endpoint

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   A   N   N   N    5.1   .0036   27.8     —

AFFECTED
  Product  Versions     Fixed
  XenForo  unspecified  —

TIMELINE
  Aug 11  Reserved by VulnCheck
  Sep 8   Published (CNA: VulnCheck)
  Sep 9   EXPLOIT PUBLISHED — CVE-2026-73320 (XenForo). Public exploit reference added.
  Sep 11  EXPLOIT PUBLISHED — CVE-2026-73320 (XenForo). Public exploit reference added.

CWE-639 · CNA: VulnCheck · CVSS v4.0 · 5 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 11, 2026	Reserved	Reserved by VulnCheck
September 8, 2026	Published	Published (CNA: VulnCheck)
September 9, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-73320 (XenForo). Public exploit reference added.
September 11, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-73320 (XenForo). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
XenForo	XenForo	—	—	—

Weaknesses

CWE-639

References (5)

https://bombobombone.github.io/posts/cve-2026-73320/ [technical-description]
https://github.com/BomboBombone/CVE-2026-73320 [exploit]
https://www.vulncheck.com/advisories/xenforo-unauthenticated-information-disclosure-via-unfurl-endpoint [third-party-advisory]
https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/ [vendor-advisory, patch]
https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/ [release-notes]

Authoritative record: CVE-2026-73320 at cve.org

Vendors: xenforo

Weaknesses: CWE-639

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-73320 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.