Vulnerability-Lookup

GHSA-8RCX-4RJR-4WPF

Vulnerability from github – Published: 2026-07-08 21:30 – Updated: 2026-07-08 21:30

Details

Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which performs no Origin header validation and requires no authentication token. Attackers can connect from any web page visited by the victim to seize the single-client slot, intercept and inject automation commands, exfiltrate command-payload data, or unconditionally terminate the server by supplying the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter.

Severity

6.8 (Medium)


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

7.6 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-59804"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-08T20:16:56Z",
    "severity": "HIGH"
  },
  "details": "Midscene Bridge Server through 1.10.3, fixed in commit 86f4118, contains a missing authentication and CORS misconfiguration vulnerability that allows unauthenticated remote attackers to hijack active bridge sessions by opening a cross-origin WebSocket connection to the local Socket.IO server, which performs no Origin header validation and requires no authentication token. Attackers can connect from any web page visited by the victim to seize the single-client slot, intercept and inject automation commands, exfiltrate command-payload data, or unconditionally terminate the server by supplying the MIDSCENE_BRIDGE_SIGNAL_KILL query parameter.",
  "id": "GHSA-8rcx-4rjr-4wpf",
  "modified": "2026-07-08T21:30:29Z",
  "published": "2026-07-08T21:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59804"
    },
    {
      "type": "WEB",
      "url": "https://github.com/web-infra-dev/midscene/issues/2752"
    },
    {
      "type": "WEB",
      "url": "https://github.com/web-infra-dev/midscene/pull/2759"
    },
    {
      "type": "WEB",
      "url": "https://github.com/web-infra-dev/midscene/commit/86f4118d1d847041c63d79e347e08c87c3f1a882"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/midscene-bridge-server-session-hijack-via-unauthenticated-websocket"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-59804 (GCVE-0-2026-59804)

Vulnerability from cvelistv5 – Published: 2026-07-08 19:42 – Updated: 2026-07-09 14:02 X_Open Source

Title

Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket

Summary

Severity

7.6 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

6.8 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-1385 - Missing Origin Validation in WebSockets
CWE-306 - Missing Authentication for Critical Function

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/web-infra-dev/midscene/issues/2752	technical-descriptionexploit
https://github.com/web-infra-dev/midscene/pull/2759	issue-tracking
https://github.com/web-infra-dev/midscene/commit/…	patch
https://www.vulncheck.com/advisories/midscene-bri…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
web-infra-dev	midscene	Affected: 0 , ≤ 1.10.3 (semver) Unaffected: 86f4118d1d847041c63d79e347e08c87c3f1a882 (git)

Date Public

2026-07-05 00:00

Credits

George Chen

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-59804",
                "options": [
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-09T14:02:32.806757Z",
                "version": "2.0.3"
              },
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/midscene",
          "product": "midscene",
          "repo": "https://github.com/web-infra-dev/midscene",
          "vendor": "web-infra-dev",
          "versions": [
            {
              "lessThanOrEqual": "1.10.3",
              "status": "affected",
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              "version": "86f4118d1d847041c63d79e347e08c87c3f1a882",
              "versionType": "git"
            }
          ]
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      "credits": [
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          "type": "finder",
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      "descriptions": [
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        }
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      "metrics": [
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            "Recovery": "NOT_DEFINED",
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            "baseSeverity": "HIGH",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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      "title": "Midscene Bridge Server - Session Hijack via Unauthenticated WebSocket",
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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    "cveId": "CVE-2026-59804",
    "datePublished": "2026-07-08T19:42:52.336Z",
    "dateReserved": "2026-07-07T14:39:14.062Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-8RCX-4RJR-4WPF

CVE-2026-59804 (GCVE-0-2026-59804)

Tags

Sightings

Nomenclature