CVE-2026-49952
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 68% of all known CVEs.
References
Related Vulnerabilities
Other CWE-323 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2017-13082 | High | 8.1 | 4.6% | - | Fix |
| CVE-2017-7902 | Critical | 9.8 | 2.6% | - | - |
| CVE-2017-13080 | Medium | 5.3 | 2.3% | - | Fix |
| CVE-2017-13084 | Medium | 6.8 | 2.2% | - | - |
| CVE-2017-13079 | Medium | 5.3 | 2.1% | - | Fix |
| CVE-2017-13078 | Medium | 5.3 | 2.1% | - | Fix |
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-16.