CVE-2026-14620: webpack-dev-server versions 5.2.5 and earlier expose two internal developer endpoints, /webpack-dev-server/ope

Q: How do I fix CVE-2026-14620?

webpack-dev-server: upgrade to 5.2.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-14620 being exploited?

CVE-2026-14620 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-14620 affect?

CVE-2026-14620 affects webpack-dev-server. Severity is medium (CVSS 4.7). 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 req

Q: How urgent is CVE-2026-14620?

Priority 32/100. Public exploit reference

Routine

MEDIUM 4.7UPGRADE

CVE-2026-14620 is a medium-severity flaw (CVSS 4.7) affecting webpack-dev-server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-352, CWE-749
Published	2026-07-03
Last modified	2026-07-07

Publisher (CNA): openjs · Vendor: webpack.js

Last updated 2026-07-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-03 17:16 UTCPublished CVE record published
2026-07-07 15:12 UTCUpdated Record last modified

webpack.js webpack-dev-server UPGRADE

Affected: < 5.2.6

Fixed in: 5.2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webpack-dev-server || rpm -q webpack-dev-server || webpack-dev-server --version

2. UPGRADE to 5.2.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webpack-dev-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webpack-dev-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: webpack_devserver 5.2.5 - CSRF

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-14620?

webpack-dev-server: upgrade to 5.2.6. Exact commands for each OS are on this page.

Is CVE-2026-14620 being exploited?

CVE-2026-14620 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-14620 affect?

CVE-2026-14620 affects webpack-dev-server. Severity is medium (CVSS 4.7). 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 req

How urgent is CVE-2026-14620?

Priority 32/100. Public exploit reference

Software pages

Webpack vulnerabilities

Related CVEs

CVE-2026-14631 MEDIUM 5.3 UPGRADE webpack-dev-server versions 5.2.5 and earlier terminate the whole Node.js process when an unauthenticated peer
CVE-2026-9595 MEDIUM 5.3 UPGRADE Impact: When a user-configured proxy on webpack-dev-server has a broad context (e.g
CVE-2026-6402 MEDIUM 5.3 UPGRADE webpack-dev-server versions up to and including 5.2.3 are vulnerable to cross-origin source code exposure when

References

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