CVE Feed

    Dashboard / CVE / CVE-2026-73311

    CVE-2026-73311

    XenForo before 2.3.13 contains an OAuth2 authorization code reuse vulnerability that allows attackers to obtain unauthorized token pairs by submitting a previously used authorization code. Attackers can exploit the failure to invalidate or mark authorization codes as consumed after initial token issuance to receive an independent token pair for the same user and scopes, bypassing the single-use guarantee of the OAuth2 authorization code flow.

    Published:Sep 8, 2026
    Last Modified:Sep 8, 2026
    EPS:Sep 8, 2026
    EPSS Score:
    CVSS Score:7.4

    Affected Products

    Vendor
    Xenforo
    Product
    Xenforo

    Exploits

    https://github.com/BomboBombone/CVE-2026-73311

    Related CVEs

    CVE-2026-74239 (CVSS 8.6) — XenForo before 2.3.13 contains a path traversal vulnerability in the style archive importer on Windows deploym…
    CVE-2026-73321 (CVSS 7.1) — XenForo before 2.3.13 contains an uncontrolled recursion vulnerability in the BBCode parser that allows authen…
    CVE-2026-73320 (CVSS 5.1) — XenForo before 2.3.13 contains an unauthenticated information disclosure vulnerability that allows unauthentic…
    CVE-2026-73319 (CVSS 5.1) — XenForo before 2.3.13 contains a cross-site scripting vulnerability in the dynamic redirect handler that allow…
    CVE-2026-73318 (CVSS 5.1) — XenForo before 2.3.13 contains a missing authorization vulnerability in the force-agreement controller that al…
    CVE-2026-73317 (CVSS 5.1) — XenForo before 2.3.13 contains a missing authorization vulnerability in the ACP cache-rebuild dispatcher that …
    CVE-2026-73316 (CVSS 8.7) — XenForo before 2.3.13 contains a payment replay vulnerability in the PayPal REST payment provider that allows …
    CVE-2026-73315 (CVSS 7.7) — XenForo before 2.3.13 contains a server-side request forgery vulnerability in the PayPal REST webhook handler …
    CVE-2026-73314 (CVSS 8.7) — XenForo before 2.3.13 contains a signature verification logic error in the PayPal REST webhook handler that al…
    CVE-2026-73313 (CVSS 7.6) — XenForo before 2.3.13 contains a multi-factor authentication bypass vulnerability in the passkey TFA provider …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High