CVE-2026-49952 PoC — Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-49952.yaml

Associated Vulnerability

Title: Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle (CVE-2026-49952)
Description:Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users.

Description

Discuz! X5.0 20260320 through 20260501 contains an authentication bypass caused by exploitation of a shared cryptographic key and encryption oracle in dbbak.php and logging_ctl::logging_more(), letting unauthenticated remote attackers access database backup and restore functions, exploit requires crafted payload injection via username parameter.

File Snapshot

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