CVE-2026-27148
Storybook dev server WebSocket hijack enables XSS/RCE via componentFilePath.
Is CVE-2026-27148 being exploited?
Not confirmed. CVE-2026-27148 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.54% probability of exploitation in the next 30 days.
How severe is CVE-2026-27148?
CVE-2026-27148 is rated High with a CVSS score of 8.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-27148?
Yes. A fix has been recorded for CVE-2026-27148. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27148 affect?
CVE-2026-27148 affects Storybook dev server (older versions prior to fix: 7.6.23, 8.6.17, 9.1.19, 10.2.10). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27148?
Upgrade to fixed versions and restrict dev-server exposure
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can inject WebSocket messages to a dev server, enabling persistent XSS or RCE via unsanitized componentFilePath when reachable.
Patch when possible
- affected< 7.6.23
- affected>= 8.1.0 and < 8.6.17
- affected>= 9.0.0 and < 9.1.19
- affected>= 10.0.0 and < 10.2.10
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.