CVE-2026-61784

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Source
https://cve.org/CVERecord?id=CVE-2026-61784
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61784.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-61784
Aliases
Published
2026-09-24T17:35:57Z
Modified
2026-09-25T03:48:34Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
xhtml-purifier has HTML attribute-injection (sanitizer bypass) that leads to XSS
Details

xhtml-purifier is a Node.js library to take in raw/unknown/untrusted HTML and output cleaned, purified, trusted HTML. Versions prior to 0.4.3 do not HTML-entity-encode attribute values when serializing its sanitized output. In attributeString() (XHTMLPurifier.js, around line 148) the attribute value is concatenated directly into a double-quoted attribute without encoding. As a result, an attacker-controlled value in any allowed attribute (class, style, title, alt, src, href) can include a double-quote character to break out of the attribute and inject an additional attribute, such as a JavaScript event handler (for example onmouseover or onerror). The injected handler survives sanitization and executes when the output is rendered, which is a sanitizer bypass leading to cross-site scripting. The fix in version 0.4.3 HTML-entity-encodes attribute values before serialization.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-116",
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61784.json"
}
References

Affected packages

Git / github.com/cstigler/node-xhtml-purifier

Affected ranges

Type
GIT
Repo
https://github.com/cstigler/node-xhtml-purifier
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8bc8f13a2ce95dc388122371846e491da361eb60
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "0.4.3"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61784.json"