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CVE-2026-14620

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

MEDIUM
4.7
CVSS Score
Published: July 3, 2026 at 05:00 PM UTC
Updated: July 7, 2026 at 03:23 PM UTC
2 products affected across 2 vendorsWebpack Dev ServerJs Webpack Dev Server

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Webpack Dev Server· Webpack Js
95%
v < 5.2.6
Affected range stops below 5.2.6, so it looks safe — our inference, not a vendor statement
Js Webpack Dev Server· Webpack Dev Server
60%
v < 5.2.6
Vendor states this is fixed in 5.2.6 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

PatchVendor Advisory
Source: cverecord
https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-f5vj-f2hx-8m93
Third Party Advisory
Source: cverecord
https://cna.openjsf.org/security-advisories.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUMopenjs
Vector?

Quick Info

StatusANALYZED
CWE
CWE-352CWE-749

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