CVE-2026-14620
webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints
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.
INFO
Published Date :
July 3, 2026, 5:16 p.m.
Last Modified :
July 7, 2026, 3:12 p.m.
Remotely Exploit :
No
Source :
ce714d77-add3-4f53-aff5-83d477b104bb
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | ce714d77-add3-4f53-aff5-83d477b104bb | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Upgrade webpack-dev-server to 5.2.6.
- Remove or secure internal developer endpoints.
- Validate request origins for internal endpoints.
Public PoC/Exploit Available at Github
CVE-2026-14620 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-14620.
| URL | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Third Party Advisory |
| https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93 | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-14620 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-14620
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
PoCs & write-ups for CVEs I reported (coordinated disclosure; published + patched only)
Shell JavaScript Go Python Java
Security research profile — advisories, tooling, certifications
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-14620 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-14620 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Reanalysis by [email protected]
Jul. 07, 2026
Action Type Old Value New Value Changed Reference Type openjs: https://cna.openjsf.org/security-advisories.html Types: Vendor Advisory openjs: https://cna.openjsf.org/security-advisories.html Types: Third Party Advisory -
Initial Analysis by [email protected]
Jul. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L Added CPE Configuration OR *cpe:2.3:a:webpack.js:webpack-dev-server:*:*:*:*:*:*:*:* versions up to (excluding) 5.2.6 Added Reference Type openjs: https://cna.openjsf.org/security-advisories.html Types: Vendor Advisory Added Reference Type openjs: https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93 Types: Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 06, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-14620', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-06T15:54:37.670158Z'} -
New CVE Received by ce714d77-add3-4f53-aff5-83d477b104bb
Jul. 03, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'webpack-dev-server', 'product': 'webpack-dev-server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.2.6', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.2.6', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/webpack-dev-server', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L Added CWE CWE-352 Added CWE CWE-749 Added Reference https://cna.openjsf.org/security-advisories.html Added Reference https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93