Critical
Security advisory
Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-58066
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:50 UTC · Revision 1
Source evidence
Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.
osv:CVE-2026-58066
Complete source record
{
"id": "60915d14f0745c64e45d8f8cdfcc165ab892989d21d235d9b108fb4e2b9c391d",
"url": "https://osv.dev/vulnerability/CVE-2026-58066",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-58066",
"summary": "Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.",
"evidence": "osv:CVE-2026-58066",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-58066",
"aliases": [
"CVE-2026-58066"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
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}
],
"modified": "2026-10-28T02:30:29.917171256Z",
"provider": "osv",
"references": [
"https://hackerone.com/reports/3827674",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58066.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-58066",
"https://github.com/RocketChat/Rocket.Chat/pull/41233"
],
"provider_metadata": {
"cwe_ids": [
"CWE-287"
],
"cna_assigner": "hackerone",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58066.json"
}
},
"related_cves": [
{
"value": "CVE-2026-58066",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 496547,
"published_at": "2026-07-30T06:03:45.178+00:00"
}