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High severity · published Oct 12, 2026
CVE-2026-84360
Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the HTTP configuration mutation routes require RequireSecureSession, but /mcp and /mcp_message require only ordinary authentication before exposing nginx_config_add and nginx_config_modify. An OTP-enabled user with a normal JWT but no valid X-Secure-Session-ID can therefore create or modify Nginx configuration and trigger reload behavior through MCP, bypassing the intended step-up control. This issue is fixed in version 2.4.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NG
nginx-ui · 0xJacky
< 2.4.1 · source: vendor
Affected product
NG
nginx-ui
0xJacky
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84360
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84360
x_refsource_CONFIRM
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp
x_refsource_MISC
https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2
x_refsource_MISC
https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1
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