CVE-2025-27109Public exploitNetwork attack vector

Cross-site scripting via unescaped JSX fragment expressions

Published Feb 21, 2025 · Updated Feb 24, 2025

Cross-site scripting in Solid before 1.9.4 allows remote attackers to inject executable HTML through server-rendered JSX fragments. The server-side ErrorBoundary, Suspense completion, and fallback paths passed resolved expression values into HTML output without escaping less-than signs or ampersands. Exposure requires a deployed application to place attacker-controlled data directly inside an inlined JSX fragment, enabling script execution in the rendered page.

CVSS severity7.3
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Solid before 1.9.4 allows remote attackers to inject executable HTML through server-rendered JSX fragments. The server-side ErrorBoundary, Suspense completion, and fallback paths passed resolved expression values into HTML output without escaping less-than signs or ampersands. Exposure requires a deployed application to place attacker-controlled data directly inside an inlined JSX fragment, enabling script execution in the rendered page.

The record

CVE
CVE-2025-27109
Published
Feb 21, 2025
Updated
Feb 24, 2025
Vendor
SolidJS
Product
Solid
Classifications
CWE-116, CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SolidJS · Solidversion=< 1.9.4

Published CVSS scores

7.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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