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Advisories

Umbraco CMS before 17.7.2 and 18.2.2 Account Takeover via Host Header Poisoning

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Severity
high
Date
Affecting

  • Umbraco-CMS >= 0, < 17.7.2

  • Umbraco-CMS >= 18.0.0, < 18.2.2

CWE
  • CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
CVSS
7.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Eu Joe Chegne (Project Umbra), Damien Wong (Project Umbra), AndyButland
Description
Umbraco CMS before 17.7.2 and 18.2.2 contains an authentication bypass vulnerability that allows unauthenticated attackers to register attacker-controlled OAuth redirect URIs by poisoning the Host header. Attackers send signed-in users authorization links using response_mode=form_post to capture codes, then redeem them via HTTP Basic client credentials to hijack back-office sessions and execute code through Razor templates.

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