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Advisory record · GHSA-mjf5-7g4m-gx5w

Storybook Dev Server is Vulnerable to WebSocket Hijacking

CVSS 8.9 HighEPSS 0.0063 · 50th percentile

Published by the GitHub Advisory Database at 26 Feb 2026, 15:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
storybooknpm>=8.1.0, <8.6.17 || >=8.7.0-alpha.0, <9.1.19 || >=10.0.0-beta.0, <10.2.108.6.17, 9.1.19, 10.2.10
Identifiers
GHSA-mjf5-7g4m-gx5w · CVE-2026-27148
Weakness (CWE)
CWE-74 · CWE-79 · CWE-346 · CWE-1385
Tags
Published
26 Feb 2026
Updated
26 Feb 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.9 High 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0063, the 50th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 26 Feb 2026. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.