{"id":"CVE-2021-22958","aliases":["GHSA-284f-f2hw-j2gx"],"url":"https://o3.security/vulnerability/CVE-2021-22958","summary":"Server-Side Request Forgery vulnerability in concrete5","details":"A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N","published":"2021-10-07T14:15:08.107Z","modified":"2026-07-09T00:12:43.772778Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"concrete5/concrete5","fixedVersion":"8.5.5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://documentation.concretecms.org/developers/introduction/version-history/855-release-notes"},{"type":"REPORT","url":"https://hackerone.com/reports/863221"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T00:12:43.772778Z"}}