{"id":"CVE-2026-27127","aliases":["GHSA-gp2f-7wcm-5fhx"],"url":"https://o3.security/vulnerability/CVE-2026-27127","summary":"Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding","details":"Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS’s GraphQL Asset mutation performs DNS resolution separately from the HTTP request. This Time-of-Check-Time-of-Use (TOCTOU) vulnerability enables DNS rebinding attacks, where an attacker’s DNS server returns different IP addresses for validation compared to the actual request. This is a bypass of the security fix for CVE-2025-68437 that allows access to all blocked IPs, not just IPv6 endpoints. Exploitation requires GraphQL schema permissions for editing assets in the `<VolumeName>` volume and creating assets in the `<VolumeName>` volume. These permissions may be granted to authenticated users with appropriate GraphQL schema access and/or Public Schema (if misconfigured with write permissions). Versions 4.16.19 and 5.8.23 patch the issue.","published":"2026-02-24T02:39:44.569Z","modified":"2026-08-07T11:50:15.863674610Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"5.8.23"},{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"4.16.19"}],"fix":{"url":"https://github.com/craftcms/cms/commit/a4cf3fb63bba3249cf1e2882b18a2d29e77a8575","label":"craftcms/cms@a4cf3fb"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27127.json"},{"type":"ADVISORY","url":"https://github.com/craftcms/cms/security/advisories/GHSA-gp2f-7wcm-5fhx"},{"type":"ADVISORY","url":"https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27127"},{"type":"FIX","url":"https://github.com/craftcms/cms/commit/a4cf3fb63bba3249cf1e2882b18a2d29e77a8575"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:15.863674610Z"}}