Security advisory

{
  "id": "4a75521540cccfc6c9d9b79b8aa27798d8af41c37698089aa31234e1a57c8c51",
  "url": "https://osv.dev/vulnerability/CVE-2021-20281",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-20281",
    "summary": "It was possible for some users without permission to view other users' full names to do so via the online users block in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.",
    "evidence": "osv:CVE-2021-20281",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-20281",
      "aliases": [
        "BIT-moodle-2021-20281",
        "CVE-2021-20281",
        "GHSA-93wh-35r4-6qmw"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/moodle/moodle",
              "type": "GIT",
              "events": [
                {
                  "introduced": "46574904afd39578fa4146bf1fc5c401ac680aa6"
                },
                {
                  "fixed": "5a1b6a9d50f5af06ac03fd9022c3fd4d23f60602"
                },
                {
                  "introduced": "f968cd44e8ee5d54b1bc56823040ff770dbf18af"
                },
                {
                  "fixed": "6f7e3ca2f7e853a183559cfb6d10fa0eb8fc6877"
                },
                {
                  "introduced": "500c131eb49771e36f68d151dfa37fef5a9bc2df"
                },
                {
                  "fixed": "02a2e649e92d570c7fa735bf05f69b588036f761"
                },
                {
                  "introduced": "ec58cefefb2722f61f77c9a2b6a12d40a8c078a0"
                },
                {
                  "fixed": "15f3dddd042a3af82120df91e835c75bf840d2e1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.5.0"
                      },
                      {
                        "fixed": "3.5.17"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.8.0"
                      },
                      {
                        "fixed": "3.8.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.9.0"
                      },
                      {
                        "fixed": "3.9.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.10.0"
                      },
                      {
                        "fixed": "3.10.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.5.16",
            "v3.8.7",
            "v3.10.1",
            "v3.9.4",
            "v3.9.3",
            "v3.5.15",
            "v3.8.6",
            "v3.10.0",
            "v3.9.2",
            "v3.8.5",
            "v3.5.14",
            "v3.5.13",
            "v3.8.4",
            "v3.9.1",
            "v3.9.0",
            "v3.8.3",
            "v3.5.12",
            "v3.8.2",
            "v3.5.11",
            "v3.5.10",
            "v3.8.1",
            "v3.8.0",
            "v3.5.9",
            "v3.5.8",
            "v3.5.7",
            "v3.5.6",
            "v3.5.5",
            "v3.5.4",
            "v3.5.3",
            "v3.5.2",
            "v3.5.1",
            "v3.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20281.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:21.355374576Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT/",
        "https://bugzilla.redhat.com/show_bug.cgi?id=1939041",
        "https://moodle.org/mod/forum/discuss.php?d=419652"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  },
                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-20281",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 430465,
  "published_at": "2021-03-15T22:15:13.25+00:00"
}