Vulnerability in Craft CMS (CVE-2026-92592)
Summary
Vulnerability in Craft CMS (CVE-2026-92592). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 4.18.6 or later.
Original description
The description as published by the source.
Craft CMS 4.8.0 through 4.18.5 and 5.0.0 through 5.10.12 sign an authenticated user's attacker-controlled license-shun cookie with the same key and format used to validate signed redirect parameters, because the HMAC signature is not bound to its purpose (Yii's cookieValidationKey is derived from the same Craft securityKey used for signed request parameters). An authenticated, non-administrator user (Control Panel access is not required) can set the cookie via the license-shun endpoint and transplant the signed envelope into the redirect parameter; on a successful login, Craft validates the signature and renders the authenticated bytes as an unsandboxed Twig template, where Twig's map filter accepts a string callback and allows PHP system() to execute arbitrary operating-system commands as the web-server user. Exploitation requires an account using password authentication without active 2FA, the default request configuration, and availability of PHP system(). The issue is fixed in 4.18.6 and 5.10.13.
Source: NIST National Vulnerability Database NVD GitHub Advisory
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-2026-92592 has been found in Craft CMS.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade Craft CMS to 4.18.6 or later.
If unsure, ask your IT team or search "Craft CMS CVE-2026-92592" on the vendor's site.
CVE-2026-92592 (Craft CMS) — CWE-1336 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Patched: 4.18.6 — 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.
A vulnerability (CWE-1336) exists in Craft CMS.
Check the vendor advisory for the affected versions of Craft CMS.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 4.18.6.
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. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Craft CMS を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade Craft CMS to 4.18.6ステージング環境で 4.18.6 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。
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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。
References
- web github.com
- web vulncheck.com
- web nvd.nist.gov
- web github.com