Moderate: sssd security update

{
  "id": "51a6505c204b1332dbd61cf48b32b30d2e3aa66a504fb616871027dfb55445b7",
  "url": "https://osv.dev/vulnerability/RLSA-2026%3A77534",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Moderate: sssd security update",
    "summary": "The System Security Services Daemon (SSSD) service provides a set of daemons to manage access to remote directories and authentication mechanisms. It also provides the Name Service Switch (NSS) and the Pluggable Authentication Modules (PAM) interfaces toward the system, and a pluggable back-end system to connect to multiple different account sources. Security Fix(es): * sssd: sssd: IdP authentication prefix comparison allows cross-user impersonation (CVE-2026-87853) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
    "evidence": "osv:RLSA-2026:77534",
    "products": [
      {
        "name": {
          "value": "sssd",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:2.12.0-3.el10_2.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RLSA-2026:77534",
      "aliases": [
        "RLSA-2026:77534"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:2.12.0-3.el10_2.2"
                }
              ],
              "database_specific": {
                "yum_repository": "BaseOS"
              }
            }
          ],
          "package": {
            "name": "sssd",
            "purl": "pkg:rpm/rocky-linux/sssd?distro=rocky-linux-10&epoch=0",
            "ecosystem": "Rocky Linux:10"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/resf-osv-data/RLSA-2026:77534.json"
          }
        }
      ],
      "modified": "2026-10-09T12:45:02.552954350Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-87853"
      ],
      "references": [
        "https://errata.rockylinux.org/RLSA-2026:77534",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2530888",
        "https://access.redhat.com/errata/RHSA-2026:77534"
      ],
      "provider_metadata": {
        "license": "CC-BY-4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "source_advisory": "RHSA-2026:77534"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-87853",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 120771,
  "published_at": "2026-10-09T12:10:46.463+00:00"
}