webpack-dev-server vulnerable to cross-site request forgery via internal developer endpoints
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Partial Red Hat: 26 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-352.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| webpack | webpack-dev-server | before 5.2.6 | 5.2.6 | Patch available | CNA |
| — | webpack-dev-server (npm) | before 5.2.6 | 5.2.6 | Patch available | GHSA-f5vj-f2hx-8m93 |
- webpack-dev-server Vendorwebpack Affected before 5.2.6 Fixed in 5.2.6 Patch available CNA
- webpack-dev-server (npm) Vendor— Affected before 5.2.6 Fixed in 5.2.6 Patch available GHSA-f5vj-f2hx-8m93
Remediation
- Fix · CNA webpack-dev-server (webpack-dev-server) Fixed in 5.2.6
- Fix · GHSA-f5vj-f2hx-8m93 webpack-dev-server (npm) Fixed in 5.2.6 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
webpack-dev-server 5.2.6
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-12328 webpack-dev-server vulnerable to denial of service via a malformed Host or Origin headerPriority LOW 31
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cryostat 4 | Affected | No fix yet: Fix deferred |
| Gatekeeper 3 | Affected | No fix yet: Fix deferred |
| Migration Toolkit for Containers | Affected | No fix yet: Fix deferred |
| Node HealthCheck Operator | Affected | No fix yet: Fix deferred |
| OpenShift Lightspeed | Affected | No fix yet: Fix deferred |
| OpenShift Pipelines | Affected | No fix yet: Fix deferred |
| OpenShift Service Mesh 3 | Affected | No fix yet: Fix deferred |
| Red Hat AMQ Broker 7 | Affected | No fix yet: Fix deferred |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet: Fix deferred |
| Red Hat Build of Podman Desktop | Affected | No fix yet: Fix deferred |
| Red Hat Connectivity Link 1 | Affected | No fix yet: Fix deferred |
| Red Hat Data Grid 8 | Affected | No fix yet: Fix deferred |
| Red Hat Developer Hub 1 | Affected | No fix yet: Fix deferred |
| Red Hat Discovery 2 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Virtualization 4 | Affected | No fix yet: Fix deferred |
| Red Hat Quay 3 | Affected | No fix yet: Fix deferred |
| Red Hat build of Apache Camel - HawtIO 4 | Affected | No fix yet: Fix deferred |
| Red Hat build of Apache Camel for Spring Boot 4 | Affected | No fix yet: Fix deferred |
| Self-service automation portal 2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-14620
- 2026-10-03 Alias added: GHSA-f5vj-f2hx-8m93
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
References
Advisory 2
More Webpack-dev-server vulnerabilities
- TI-2025-21666 Origin validation error in webpack-dev-server CVSS 3.1MEDIUM 6.5
- TI-2025-21665 webpack-dev-server users' source code may be stolen when they access a malicious web site CVSS 3.1MEDIUM 5.9
- TI-2018-10580 An issue was discovered in lib/Server.js in webpack-dev-server before 3.1.6. CVSS 3.0HIGH 7.5
- TI-2026-79248 Missing Origin checks on proxied WebSockets in webpack-dev-server CVSS 3.1HIGH 8.2
- TI-2026-12328 webpack-dev-server vulnerable to denial of service via a malformed Host or Origin header CVSS 3.1MEDIUM 5.3
- TI-2026-79254 Host validation bypass in webpack-dev-server leaks stack traces CVSS 3.1MEDIUM 5.3
Sources
- CVE-2026-14620 · CVE Program
- CVE-2026-14620 · NVD
- FIRST EPSS
- GHSA-f5vj-f2hx-8m93 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-14620 · Red Hat security data · CC BY 4.0
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