High
HTTP signature verification can be bypassed
Type: advisorySources: OSV
Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-28432
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 02:35 UTC · Revision 1
Source evidence
HTTP signature verification can be bypassed
core-osv · Original sourcePublished 9 Mar 2026, 21:19 UTC
Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.
osv:CVE-2026-28432
Complete source record
{
"id": "bfd5e21a91cca1e3bba6b16e3cc8c48c39578807b443a30caeeb65953a16491e",
"url": "https://osv.dev/vulnerability/CVE-2026-28432",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "HTTP signature verification can be bypassed",
"summary": "Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.",
"evidence": "osv:CVE-2026-28432",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-28432",
"aliases": [
"CVE-2026-28432",
"GHSA-grwc-c762-gcvp"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/misskey-dev/misskey",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "4ec56ba9f65d2756125c54a86f575ae947db21f6"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.3.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"cpe": "cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.3.1"
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"source": "CPE_RANGE"
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],
"modified": "2026-10-28T02:30:25.385195199Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28432.json",
"https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp",
"https://nvd.nist.gov/vuln/detail/CVE-2026-28432"
],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28432.json"
}
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{
"value": "CVE-2026-28432",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491948,
"published_at": "2026-03-09T21:19:43.22+00:00"
}