webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints (CVE-2026-14620) | HOL Guard CVE

Medium · CVSS 4.7CVE-2026-14620

webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints

Answer in brief

CVE-2026-14620 records a Medium severity (CVSS 4.7) vulnerability in webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints. The current sources do not mark it as known exploited. The current feed maps webpack-dev-server/webpack-dev-server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 3, 2026Updated Jul 7, 2026Source checked Sep 19, 2026First seen by HOL Jul 3, 2026Material review Jul 7, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps webpack-dev-server/webpack-dev-server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
webpack-dev-server/webpack-dev-servergeneric	>=0 <5.2.6	5.2.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for webpack-dev-server/webpack-dev-server.
Review the reported fix. Update webpack-dev-server/webpack-dev-server to 5.2.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 3, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.