Medium
Security advisory
This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-23342
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:39 UTC · Revision 1
Source evidence
This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters
osv:CVE-2021-23342
Complete source record
{
"id": "76fc7f3ffc829ee11ca59a40f86299829681abe28238124aec60b48442d1af82",
"url": "https://osv.dev/vulnerability/CVE-2021-23342",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-23342",
"summary": "This affects the package docsify before 4.12.0. It is possible to bypass the remediation done by CVE-2020-7680 and execute malicious JavaScript through the following methods 1) When parsing HTML from remote URLs, the HTML code on the main page is sanitized, but this sanitization is not taking place in the sidebar. 2) The isURL external check can be bypassed by inserting more “////” characters",
"evidence": "osv:CVE-2021-23342",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-23342",
"aliases": [
"CVE-2021-23342",
"GHSA-2mm9-c2fx-c7m4"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/docsifyjs/docsify",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "a2132c89eabc0d93c9501479d430ce44205b0b47"
},
{
"fixed": "ff2a66f12752471277fe81a64ad6c4b2c08111fe"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:docsifyjs:docsify:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.12.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "ff2a66f12752471277fe81a64ad6c4b2c08111fe"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"v4.11.5",
"v4.11.4",
"v4.11.3",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23342.json"
}
}
],
"modified": "2026-10-20T10:54:31.835881434Z",
"provider": "osv",
"references": [
"https://github.com/docsifyjs/docsify/commit/ff2a66f12752471277fe81a64ad6c4b2c08111fe",
"https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1076593",
"https://snyk.io/vuln/SNYK-JS-DOCSIFY-1066017"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-23342",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 385489,
"published_at": "2021-02-19T17:15:13.717+00:00"
}