CVE-2026-93981: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in honojs hono
hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.
AI Analysis
Technical Summary
hono versions prior to 4.13.7 fail to properly HTML-escape plain strings rendered by hono/jsx in several server-side rendering contexts. These contexts stringify input and treat it as already escaped markup, enabling an attacker who controls such input to inject arbitrary HTML and execute scripts in the context of the application origin. This is classified as an improper neutralization of input during web page generation, commonly known as cross-site scripting (XSS).
Potential Impact
An attacker able to control input in the affected rendering paths can inject arbitrary HTML and execute JavaScript in the security context of the vulnerable application. This can lead to script execution under the application's origin, potentially enabling actions such as session hijacking or unauthorized actions within the application. The CVSS 4.0 score is low (2.3) reflecting the requirement for attacker presence and user interaction, as well as limited scope and impact.
Mitigation Recommendations
Upgrade hono to version 4.13.7 or later where this vulnerability is fixed. No other mitigation guidance is provided or necessary as the fix is available in the official release.
CVE-2026-93981: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in honojs hono
Description
hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.
CVSS v4.0
Score 2.3low
Affected software
honojs
hono
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
hono versions prior to 4.13.7 fail to properly HTML-escape plain strings rendered by hono/jsx in several server-side rendering contexts. These contexts stringify input and treat it as already escaped markup, enabling an attacker who controls such input to inject arbitrary HTML and execute scripts in the context of the application origin. This is classified as an improper neutralization of input during web page generation, commonly known as cross-site scripting (XSS).
Potential Impact
An attacker able to control input in the affected rendering paths can inject arbitrary HTML and execute JavaScript in the security context of the vulnerable application. This can lead to script execution under the application's origin, potentially enabling actions such as session hijacking or unauthorized actions within the application. The CVSS 4.0 score is low (2.3) reflecting the requirement for attacker presence and user interaction, as well as limited scope and impact.
Mitigation Recommendations
Upgrade hono to version 4.13.7 or later where this vulnerability is fixed. No other mitigation guidance is provided or necessary as the fix is available in the official release.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-19T10:55:49.092Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aae79c155bf5e2cf58252bd
Added to database: 09/19/2026, 12:02:09 UTC
Last enriched: 09/19/2026, 12:16:46 UTC
Last updated: 09/19/2026, 22:12:52 UTC
Views: 13
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