What is CVE-2025-27109?

CVE-2025-27109 is a high-severity vulnerability in Solidjs Solid, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2025-02-21.

How severe is CVE-2025-27109?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Solidjs Solid

CVE-2025-27109

solid-js is a declarative, efficient, and flexible JavaScript library for building user interfaces. In affected versions Inserts/JSX expressions inside illegal inlined JSX fragments lacked escaping, allowing user input to be rendered as HTML when put directly inside JSX fragments. This issue has been addressed in version 1.9.4 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (24.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Solidjs Solid — versions < 1.9.4

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-27109?: CVE-2025-27109 is a high-severity vulnerability in Solidjs Solid, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2025-02-21.
How severe is CVE-2025-27109?: High severity. CVSS v3 base score is 7.3 out of 10.