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Public proof of conceptFix available

CVE-2026-14620

A public proof of concept exists; no exploitation attested.

  • Published2026-07-03
  • Fixed in5.2.6
  • WeaknessCWE-352 · CWE-749

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-08-17Exploit-DB entryExploit-DB

Versions per branch

NVD · OSV
Webpack.js webpack-dev-server
BranchAffectedFixed in
5.2< 5.2.65.2.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As openjs, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • webpack-dev-serverother versions: not affected
    Affected
    • < 5.2.6fixed in 5.2.6semver

    Not affected = 5.2.6

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-03

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.2.2-root.io.3
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 3.11.3-root.io.4
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 4.10.0-root.io.3
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.0.4-root.io.2
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.2.3-root.io.3
  • @rootio/webpack-dev-serverRoot:npmall versions · fixed in 5.2.4-root.io.2
  • arangodb-3.11Chainguardall versions · fixed in 3.11.14.5-r25
  • arangodb-3.12Chainguardall versions · fixed in 3.12.11-r0

33 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-14620 Red Hat Product Security82 known affected

    webpack-dev-server: webpack-dev-server: Arbitrary file opening and denial of service via exposed developer endpoints

    cryostat-openshift-console-plugin-npm as a component of Cryostat 4 · webpack-dev-server as a component of Cryostat 4 · gatekeeper/gatekeeper-rhel9 as a component of Gatekeeper 3 · +79 more

Full record on NVD

Fix

  1. Update Webpack.js webpack-dev-server to 5.2.6
  2. Workaround from the vendor Red Hat Product Security CVE-2026-14620 · 82 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-14620 · 82 productsFix deferred

Advisories and patches

Detection

read 2026-11-09 09:28 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-52649
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-07-06
  • CNACVSS 3.14.7known since 2026-10-23
  • NVDCVSS 3.14.7read 2026-10-23
  • CNAweakness (CWE)CWE-352, CWE-749known since 2026-10-23
  • FIRST EPSSEPSS score0.5 %2026-11-08
  • Exploit-DBdetectionread 2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-07-20

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Published
2026-07-03
Last Modified
2026-07-07
NVD status
Analyzed
GitHub Advisory
GHSA-f5vj-f2hx-8m93

Frequently asked questions

What is CVE-2026-14620?

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.

Is CVE-2026-14620 actively exploited?

Active exploitation of CVE-2026-14620 has not been confirmed. Its EPSS score was 0.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-14620?

CVE-2026-14620 has a CVSS v3 base score of 4.7 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L.

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