🛡️ CVE-2026-27148 on npm (Root.io) — storybook

Distribution advisory

This page covers CVE-2026-27148 as tracked by npm (Root.io), for the package storybook. The fix is available in version 9.1.15-root.io.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must actively cooperate. Rated impact: confidentiality high, integrity high, availability high. (rating taken from the base CVE record.)

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Attack requirements: Present — the target has to be in a particular state for the attack to work.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Active — the victim has to cooperate with the attack.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

ROOT-APP-NPM-CVE-2026-27148 is classified as CWE-1385: Missing Origin Validation in WebSockets. The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.

Affected software

ROOT-APP-NPM-CVE-2026-27148 is recorded against 2 packages.

• @rootio/storybook (fixed in 9.1.15-root.io.1)
• storybook (fixed in 9.1.15-aikido.1)

Timeline and source

Published on 10 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

Other advisories for this package

@rootio/storybook has other advisories on record. If you are patching this one, these are worth checking on the same host:

• ROOT-APP-NPM-CVE-2025-68429 (5.0 Medium, published 10 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-1385: Missing Origin Validation in WebSockets) in other software:

• CVE-2026-59950 (8.0 High, published 23 Jul 2026)
• CVE-2026-57111 (7.5 High, published 9 Jul 2026)
• CVE-2026-21883 (5.4 Medium, published 7 Jul 2026)
• CVE-2026-44514 (6.5 Medium, published 25 Jun 2026)
• CVE-2026-34403 (8.1 High, published 25 Jun 2026)
• CVE-2026-44211 (9.5 Critical, published 8 May 2026)
• CVE-2026-35589 (8.0 High, published 14 Apr 2026)
• CVE-2026-27977 (5.4 Medium, published 18 Mar 2026)

Details

Affected Packages

References