Medium
Security advisory
Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request token. This issue has been fixed in version 12.51.0. There are no known workarounds aside from upgrading.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-39169
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:53 UTC · Revision 1
Source evidence
Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request token. This issue has been fixed in version 12.51.0. There are no known workarounds aside from upgrading.
osv:CVE-2021-39169
Complete source record
{
"id": "0c2a9d6a341a7e858b7310bc566054d1d43998526128ad2cb2cc3588a37a3244",
"url": "https://osv.dev/vulnerability/CVE-2021-39169",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-39169",
"summary": "Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request token. This issue has been fixed in version 12.51.0. There are no known workarounds aside from upgrading.",
"evidence": "osv:CVE-2021-39169",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-39169",
"aliases": [
"CVE-2021-39169",
"GHSA-pmmv-jwqh-f5ww"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/misskey-dev/misskey",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "629b765abcab091c2a0d30ef5e881d28e2badf02"
},
{
"fixed": "ec203f7f795766f76b55fecc9248168c1cdf6c99"
}
],
"database_specific": {
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{
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"range": [
{
"introduced": "0"
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{
"fixed": "12.51.0"
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"source": "CPE_RANGE"
},
{
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"source": "REFERENCES_COMMIT"
}
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}
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],
"modified": "2026-10-20T10:54:53.306988370Z",
"provider": "osv",
"references": [
"https://github.com/misskey-dev/misskey/commit/ec203f7f795766f76b55fecc9248168c1cdf6c99",
"https://github.com/misskey-dev/misskey/security/advisories/GHSA-pmmv-jwqh-f5ww"
],
"provider_metadata": {}
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{
"value": "CVE-2021-39169",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 386370,
"published_at": "2021-08-27T13:15:07.02+00:00"
}