CVE-2026-84321 json
Nginx UI: Standalone short tokens survive administrative revocation in cache and authenticate again after account re-enable
published 30d ago modified 23d ago also EUVD-2026-97864 , GHSA-wq4w-vwvq-q3x9 , GO-2026-6801
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/0xJacky/Nginx-UI 1.9.10-0.20260703131214-23d1934099b0
- nginxui nginx_ui 2.4.1
Is CVE-2026-84321 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 29d ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/0xJacky/Nginx-UI | <1.9.10-0.20260703131214-23d1934099b0 |
1.9.10-0.20260703131214-23d1934099b0 |
Affected products
- 0xJacky nginx-ui
Classification
- Weakness
-
- CWE-613 DEPRECATED: Insufficient Session Expiration
References
-
github.com
/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2
web
-
github.com
/0xJacky/nginx-ui/security/advisories/GHSA-wq4w-vwvq-q3x9
web, advisory
-
github.com
/0xJacky/nginx-ui/releases/tag/v2.4.1
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-84321
advisory
-
github.com
/0xJacky/nginx-ui
package
Sources
- CVE List CVE-2026-84321
- GitHub Advisory GHSA-wq4w-vwvq-q3x9
- NVD CVE-2026-84321
- OSV GO-2026-6801
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.