Vulnerability in Octobercms October
CVE-2021-21265
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.017 (77.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Octobercms October — versions < 1.1.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/octobercms/october/security/advisories/GHSA-xhfx-hgmf-v6vp (Patch, Third Party Advisory)
- github.com/octobercms/library/commit/f29865ae3db7a03be7c49294cd93980ec457f10d
- github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 (Patch, Third Party Advisory)
- github.com/octobercms/october/commit/555ab61f2313f45d7d5d138656420ead536c5d30
- github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 (Patch, Third Party Advisory)
- packagist.org/packages/october/backend
Frequently asked questions
- What is CVE-2021-21265?
- CVE-2021-21265 is a medium-severity vulnerability in Octobercms October, classified under Improper Neutralization of HTTP Headers for Scripting Syntax. CVSS score: 6.8/10. Published 2021-03-10.
- How severe is CVE-2021-21265?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2021-21265 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.