GHSA-F5VJ-F2HX-8M93

Vulnerability from github – Published: 2026-07-20 22:01 – Updated: 2026-07-20 22:01
VLAI
Summary
webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints
Details

Impact

The internal /webpack-dev-server/open-editor and /webpack-dev-server/invalidate endpoints perform state-changing actions on any GET request, without verifying that the request originated from the dev server's own page. Any website a developer visits while the dev server is running can trigger them cross-origin with no interaction beyond the visit.

An attacker can open an arbitrary existing local file in the developer's editor, including files outside the project root (e.g. ~/.ssh/config). The file's contents are not returned to the attacker. Repeated requests can also spawn editor processes and force recompilations, degrading the developer's machine.

Patches

Fixed in webpack-dev-server 5.2.6 by rejecting cross-site requests to the /webpack-dev-server/open-editor and /webpack-dev-server/invalidate endpoints (see PR #5698).

Workarounds

None

Severity
4.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.2.5"
      },
      "package": {
        "ecosystem": "npm",
        "name": "webpack-dev-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-14620"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352",
      "CWE-749"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-20T22:01:56Z",
    "nvd_published_at": "2026-07-03T17:16:53Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nThe internal `/webpack-dev-server/open-editor` and `/webpack-dev-server/invalidate` endpoints perform state-changing actions on any `GET` request, without verifying that the request originated from the dev server\u0027s own page. Any website a developer visits while the dev server is running can trigger them cross-origin with no interaction beyond the visit.\n\nAn attacker can open an arbitrary existing local file in the developer\u0027s editor, including files outside the project root (e.g. `~/.ssh/config`). The file\u0027s contents are not returned to the attacker. Repeated requests can also spawn editor processes and force recompilations, degrading the developer\u0027s machine.\n\n### Patches\n\nFixed in `webpack-dev-server` 5.2.6 by rejecting cross-site requests to the `/webpack-dev-server/open-editor` and `/webpack-dev-server/invalidate` endpoints (see [PR #5698](https://github.com/webpack/webpack-dev-server/pull/5698)).\n\n### Workarounds\n\nNone",
  "id": "GHSA-f5vj-f2hx-8m93",
  "modified": "2026-07-20T22:01:56Z",
  "published": "2026-07-20T22:01:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14620"
    },
    {
      "type": "WEB",
      "url": "https://github.com/webpack/webpack-dev-server/pull/5698"
    },
    {
      "type": "WEB",
      "url": "https://github.com/webpack/webpack-dev-server/commit/80cd9eea54975fe632a518d8bd902a260f374e7c"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/webpack/webpack-dev-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/webpack/webpack-dev-server/releases/tag/v5.2.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints"
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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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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