Vulnerability in 0xjacky Nginx-Ui
CVE-2026-84321
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, GenerateShortToken creates standalone short-token records without a long Token value, but DeleteUserTokens invalidates cached entries only when the long Token field is nonempty. A revoked short token can therefore remain in the short_token cache and authenticate again if the associated account is re-enabled before the cache entry expires because GetTokenUserByShortToken reads the surviving entry, restoring access to HTTP or WebSocket routes that accept short-token authentication. This issue is fixed in version 2.4.1.
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- 0xjacky Nginx-Ui — versions < 2.4.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-84321?
- CVE-2026-84321 is a medium-severity vulnerability in 0xjacky Nginx-Ui, classified under Insufficient Session Expiration. CVSS score: 5.4/10. Published 2026-10-12.
- How severe is CVE-2026-84321?
- Medium severity. CVSS v3 base score is 5.4 out of 10.