CVE-2026-53595— FreeScout vulnerable to anonymous account takeover via /user-setup empty invite_hash on MySQL

FreeScout vulnerable to anonymous account takeover via /user-setup empty invite_hash on MySQL

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.224, the public endpoint `POST /user-setup/{hash}/{invite_sent_at}` (`OpenController@userSetupSave`) selects the target account solely by its `invite_hash` column, then overwrites that account's email and password and logs in as it. No authentication, cookie, or prior session is required. After a user activates, FreeScout sets `invite_hash` to the empty string. On MySQL and MariaDB, `VARCHAR` equality ignores trailing spaces, so a single URL-encoded space (`%20`) matches the stored empty string and selects the lowest-id activated user. The expiry guard decrypts `invite_sent_at` with the target's password hash, but `Helper::decrypt` returns its raw input unchanged when decryption fails. A plaintext numeric value such as `9999999999` therefore passes the time-to-live check without any secret. The result is that an anonymous attacker sets the email and password of the lowest-id activated FreeScout account (a support agent, or an administrator if one was added by invitation) and authenticates as that account. Version 1.8.224 contains a fix.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

大小写敏感处理不恰当

FreeScout 输入验证错误漏洞

FreeScout是FreeScout公司开源的一个使用 PHP(Laravel 框架)构建的超轻量级且功能强大的免费开源帮助台和共享收件箱。 FreeScout 1.8.224之前版本存在安全漏洞，该漏洞源于对`invite_hash`列的不当处理及`Helper::decrypt`解密失败时返回原始输入，允许未认证的匿名攻击者通过URL编码空格匹配空字符串来覆盖最低ID激活用户的邮箱和密码并登录该账户。

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