{"cve":"CVE-2021-21265","nvd":{"published":"2021-03-10T22:15:12.057","modified":"2026-06-17T03:35:09.290","status":"Modified","description":"October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-644"],"references":["https://github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d","https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6","https://github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30","https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0","https://github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp"],"products":["octobercms:october"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-21265","score":0.01748,"percentile":0.77837,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}