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CVE-2026-42610 medium CVSS 6.5

Authorization Flaw in getgrav/grav (CVE-2026-42610)

Summary

Vulnerability in getgrav/grav (CVE-2026-42610). Confidential information can be exposed externally. Exploitable via editor_chen. Mitigation: upgrade to 2.0.0-beta.2 or later.

Original description

The description as published by the source.

Summary

Information disclosure exists in Grav CMS v1.8.0-beta.29. Despite previous security patches (notably in v1.8.0-beta.27/28) aimed at restricting sensitive object access within the Twig environment, the Accounts Service remains exposed.

A low-privileged user (EX: Content Editor with only pages.update permissions) can bypass the existing Twig sandbox restrictions by utilizing the grav['accounts'] service. Attacker can programmatically load administrative user objects and extract sensitive data, including Bcrypt password hashes and the security salt.

Affected version

Grav CMS: v1.8.0-beta.29 (and earlier 1.8.x beta versions).

Note: This vulnerability persists even after the vendor attempted to mitigate similar SSTI vectors in earlier beta releases.

Steps to Reproduce

  1. Create a low-privileged account (MY CASE IS 'editor_chen') with permissions limited to admin.login and basic page management (create, update, list). Ensure all administrative permissions (Configuration, User Accounts, ...) are explicitly Denied.

  2. Login to the Admin panel using editor_chen. Navigate to Pages and edit the Home page.

  3. Under the Advanced tab, ensure Process Twig is enabled .

  4. In the Content tab, inject the following Twig payload designed to bypass the isDangerousFunction filter by accessing the internal service container:

---
title: Information Disclosure Test
process:
    twig: true
---
# Security Audit Results
- Admin Password Hash: {{ grav['accounts'…

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-2026-42610 has been found in getgrav/grav.
Attackers can target a specific entry point like editor_chen over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade getgrav/grav to 2.0.0-beta.2 or later.
If unsure, ask your IT team or search "getgrav/grav CVE-2026-42610" on the vendor's site.

CVE-2026-42610 (getgrav/grav) — CWE-863 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: editor_chen / Home / isDangerousFunction / d904efc33
Patched: 2.0.0-beta.2 — 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.

❓ What is the problem

Incorrect authorization (CWE-863) exists in getgrav/grav. Attackers reach the vulnerable code path via editor_chen.

📍 Affected scope

Check the vendor advisory for the affected versions of getgrav/grav. Attack surface: editor_chen / Home / isDangerousFunction / d904efc33.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 2.0.0-beta.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'getgrav/grav' . 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

  1. 1
    Identify exposure identify 
    grep -r 'getgrav/grav' . | 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 getgrav/grav を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade getgrav/grav to 2.0.0-beta.2

    ステージング環境で 2.0.0-beta.2 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。

  3. 3
    Post-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

composer getgrav/grav
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0-beta.2"}]}]
Packagist getgrav/grav
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.0-beta.2"}]}]

References

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