Authentication Bypass in october/october (CVE-2021-41126)
Summary
Authentication bypass in october/october (CVE-2021-41126). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 2.1.12 or later.
Original description
The description as published by the source.
October is a Content Management System (CMS) and web platform built on the the Laravel PHP Framework. In affected versions administrator accounts which had previously been deleted may still be able to sign in to the backend using October CMS v2.0. The issue has been patched in v2.1.12 of the october/october package. There are no workarounds for this issue and all users should update.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2021-41126 has been found in october/october.
Successful exploitation can lead to full system takeover.
What to do: upgrade october/october to 2.1.12 or later.
If unsure, ask your IT team or search "october/october CVE-2021-41126" on the vendor's site.
CVE-2021-41126 (october/october) — CWE-287
Attack vector: remote (network-reachable) / no user interaction
Patched: 2.1.12 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Authentication bypass (CWE-287) exists in october/october.
Check the vendor advisory for the affected versions of october/october.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 2.1.12.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'october/october' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'october/october' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
october/octoberを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade october/october to 2.1.12ステージング環境で 2.1.12 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory octobercms.com
- package github.com