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CVE-2026-47732 medium CVSS 6.5

Authorization Flaw in twig/twig (CVE-2026-47732)

Summary

Vulnerability in twig/twig (CVE-2026-47732). Confidential information can be exposed externally. Exploitable via SandboxNodeVisitor. Mitigation: upgrade to 3.26.0 or later.

Original description

The description as published by the source.

Description

SandboxNodeVisitor enforces SecurityPolicy::checkMethodAllowed() for implicit __toString() calls by wrapping selected AST nodes in CheckToStringNode. The set of wrapped nodes is incomplete, and several Twig language constructs still trigger PHP string coercion on a Stringable operand without first consulting the policy. A sandboxed template author can therefore invoke __toString() on any object reachable in the render context, even when __toString on its class is not allowlisted.

Confirmed bypass vectors:

  • Conditional expressions (a ? b : c, a ?: b, a ?? b) used as the input of a string-coercing filter or as a filter/function argument.
  • The matches operator and the loose comparison operators (==, !=, <, >, <=, >=, <=>), which coerce a Stringable operand to string and can be used as an oracle to recover the value byte by byte (no tag, filter or function needs to be allowlisted).
  • Twig tests in general (which were never policy-gated), in particular is empty which casts a Stringable value via (string) $value in CoreExtension::testEmpty().
  • Null-coalesce expressions nested in concatenation, and the direct output of allowed functions or filters that return a Stringable object.
  • Arguments passed to allowed object methods, template-name expressions of template-loading tags (include, extends, use, ...), dynamic attribute/property names, and spread arguments from Traversable objects.
  • The do tag and the…

Source: GitHub Security Advisories (Global) 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-2026-47732 has been found in twig/twig.
Attackers can target a specific entry point like SandboxNodeVisitor over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade twig/twig to 3.26.0 or later.
If unsure, ask your IT team or search "twig/twig CVE-2026-47732" on the vendor's site.

CVE-2026-47732 (twig/twig) — CWE-863 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: SandboxNodeVisitor / CheckToStringNode / Stringable / __toString
Patched: 3.26.0 — 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 twig/twig. Attackers reach the vulnerable code path via SandboxNodeVisitor.

📍 Affected scope

Check the vendor advisory for the affected versions of twig/twig. Attack surface: SandboxNodeVisitor / CheckToStringNode / Stringable / __toString.

🔥 Severity

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

🔧 How to fix

Update to 3.26.0.

🛡️ 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 'twig/twig' . 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 'twig/twig' . | 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 twig/twig 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 twig/twig to 3.26.0

    ステージング環境で 3.26.0 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 twig/twig
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.0"}]}]
Packagist twig/twig
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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