CVE-2026-24771Network attack vector

Browser script execution via raw ErrorBoundary output

Published Jan 27, 2026 · Updated Jan 27, 2026

Cross-site scripting in Hono before 4.11.7 allows remote attackers to execute JavaScript in a victim's browser through ErrorBoundary. ErrorBoundary in src/jsx/components.ts forced rendered child and fallback paths to raw HTML, bypassing the JSX library's default escaping. Exploitation requires an application to place unsanitized user-controlled strings in ErrorBoundary children or fallbackRender and a victim to load the resulting page.

CVSS severity4.7
Medium
EPSS probability0.31%
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 Hono before 4.11.7 allows remote attackers to execute JavaScript in a victim's browser through ErrorBoundary. ErrorBoundary in src/jsx/components.ts forced rendered child and fallback paths to raw HTML, bypassing the JSX library's default escaping. Exploitation requires an application to place unsanitized user-controlled strings in ErrorBoundary children or fallbackRender and a victim to load the resulting page.

The record

CVE
CVE-2026-24771
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
Hono
Product
Hono
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record 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=< 4.11.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hono · Honoversion=< 4.11.7

Published CVSS scores

4.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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