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Advisories

XenForo < 2.3.13 Refresh Token Replay via Expired Access Token

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severity
critical
date
Affecting

  • XenForo < 2.3.13

CWE
  • CWE-294 Authentication Bypass by Capture-replay
CVSS
9.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
Marco Paciaroni (BomboBombone)
Description
XenForo before 2.3.13 contains a refresh token replay vulnerability that allows attackers to reuse a refresh token multiple times by exploiting the failure to mark tokens as consumed when the parent access token has expired. Attackers can repeatedly submit the same refresh token to generate additional independent token pairs, achieving persistent unauthorized access for the token's full lifetime.

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