CVE-2026-27148: Storybook is a frontend workshop for building user interface components and pages in isolation

Q: How do I fix CVE-2026-27148?

storybook: upgrade to 7.6.23, 8.6.17, 9.1.19, 10.2.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-27148 being exploited?

CVE-2026-27148 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-2026-27148 affect?

CVE-2026-27148 affects storybook. Severity is critical (CVSS 9.6). Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories,

Q: How urgent is CVE-2026-27148?

Priority 46/100. Critical severity

This month

CRITICAL 9.6UPGRADE

CVE-2026-27148 is a critical-severity flaw (CVSS 9.6) affecting storybook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories, is vulnerable to WebSocket hijacking. This vulnerability only affects the Storybook dev server; production builds are not impacted. Exploitation requires a developer to visit a malicious website while their lo

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-74, CWE-79, CWE-346
Published	2026-02-25
Last modified	2026-07-15

Publisher (CNA): GitHub, Inc. · Vendor: storybook

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-25 22:16 UTCPublished CVE record published
2026-07-15 02:19 UTCUpdated Record last modified

storybook storybook UPGRADE

Affected: < 7.6.23 · >= 8.1.0 and < 8.6.17 · >= 9.0.0 and < 9.1.19 · >= 10.0.0 and < 10.2.10

Fixed in: 7.6.23, 8.6.17, 9.1.19, 10.2.10

Safe to downgrade to: a release before 8.1.0

1. Check installed version

npm ls storybook

2. UPGRADE to 7.6.23

npm install storybook@">=7.6.23"

3. If no update is available yet, DOWNGRADE to a release before 8.1.0

npm view storybook versions npm install storybook@"<8.1.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-27148?

storybook: upgrade to 7.6.23, 8.6.17, 9.1.19, 10.2.10. Exact commands for each OS are on this page.

Is CVE-2026-27148 being exploited?

CVE-2026-27148 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-2026-27148 affect?

CVE-2026-27148 affects storybook. Severity is critical (CVSS 9.6). Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories,

How urgent is CVE-2026-27148?

Priority 46/100. Critical severity

Related CVEs

CVE-2025-68429 HIGH 7.3 UPGRADE Storybook is a frontend workshop for building user interface components and pages in isolation

References

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