Vulnerability-Lookup

CVE-2026-56761 (GCVE-0-2026-56761)

Vulnerability from cvelistv5 – Published: 2026-06-24 11:53 – Updated: 2026-06-24 12:18

Title

hono - HTML Injection via Improper JSX Attribute Name Handling in SSR

Summary

hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attackers to inject unintended html by using malformed attribute names. Attackers can craft specially crafted attribute keys containing characters like quotes or angle brackets to break html tag boundaries and inject arbitrary attributes or elements.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

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

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/honojs/hono/security/advisorie…	vendor-advisory
https://www.vulncheck.com/advisories/hono-html-in…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
hono	hono	Affected: 0 , < 4.12.14 (semver) Unaffected: 4.12.14 (semver)

Date Public

2026-04-15 00:00

Credits

tndud042713

Show details on NVD website

JSON

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GHSA-458J-XX4X-4375

Vulnerability from github – Published: 2026-04-16 01:02 – Updated: 2026-06-24 13:10

Summary

hono Improperly Handles JSX Attribute Names Allows HTML Injection in hono/jsx SSR

Details

Summary

Improper handling of JSX attribute names in hono/jsx allows malformed attribute keys to corrupt the generated HTML output.

When untrusted input is used as attribute keys during server-side rendering, specially crafted keys can break out of attribute or tag boundaries and inject unintended HTML.

Details

When rendering JSX elements to HTML strings, attribute values are escaped, but attribute names (keys) were previously inserted into the output without validation.

If an attribute name contains characters such as ", >, or whitespace, it can alter the structure of the generated HTML.

For example, malformed attribute names can:

Break out of the current attribute and introduce unintended additional attributes
Break out of the current HTML tag and inject new elements into the output

This issue arises when untrusted input (such as query parameters or form data) is used as JSX attribute keys during server-side rendering.

Impact

An attacker who can control attribute keys used in JSX rendering may inject unintended attributes or HTML elements into the generated output.

This may lead to:

Injection of unexpected HTML attributes
Corruption of the HTML structure
Potential cross-site scripting (XSS) if combined with unsafe usage patterns

This issue affects applications that pass untrusted input as JSX attribute keys during server-side rendering.

Severity

4.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "hono"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.12.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-56761"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T01:02:24Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nImproper handling of JSX attribute names in hono/jsx allows malformed attribute keys to corrupt the generated HTML output.\n\nWhen untrusted input is used as attribute keys during server-side rendering, specially crafted keys can break out of attribute or tag boundaries and inject unintended HTML.\n\n## Details\n\nWhen rendering JSX elements to HTML strings, attribute values are escaped, but attribute names (keys) were previously inserted into the output without validation.\n\nIf an attribute name contains characters such as `\"`, `\u003e`, or whitespace, it can alter the structure of the generated HTML.\n\nFor example, malformed attribute names can:\n\n* Break out of the current attribute and introduce unintended additional attributes\n* Break out of the current HTML tag and inject new elements into the output\n\nThis issue arises when untrusted input (such as query parameters or form data) is used as JSX attribute keys during server-side rendering.\n\n## Impact\n\nAn attacker who can control attribute keys used in JSX rendering may inject unintended attributes or HTML elements into the generated output.\n\nThis may lead to:\n\n* Injection of unexpected HTML attributes\n* Corruption of the HTML structure\n* Potential cross-site scripting (XSS) if combined with unsafe usage patterns\n\nThis issue affects applications that pass untrusted input as JSX attribute keys during server-side rendering.",
  "id": "GHSA-458j-xx4x-4375",
  "modified": "2026-06-24T13:10:57Z",
  "published": "2026-04-16T01:02:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-458j-xx4x-4375"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/hono"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "hono Improperly Handles JSX Attribute Names Allows HTML Injection in hono/jsx SSR"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-56761 (GCVE-0-2026-56761)

GHSA-458J-XX4X-4375

Summary

Details

Impact

Tags

Sightings

Nomenclature