Information Disclosure in contao/core-bundle (CVE-2026-107842)
Summary
Vulnerability in contao/core-bundle (CVE-2026-107842). Risk of unauthorized operations or information disclosure. Exploitable via ModuleSearch. Mitigation: upgrade to 5.7.12 or later.
Original description
The description as published by the source.
ModuleSearch decides whether to filter protected pages out of search results based on the current value of contao.search.index_protected, but the authorisation data lives per row in tl_search. Turning the setting off removes
the filter without removing the rows, so protected pages that were indexed while it was on are returned to unauthenticated visitors such as title, URL and context snippet, even though the pages themselves still answer 401.
Impact
Disclosure of member-only page titles, URLs and indexed text to unauthenticated visitors through the site search. The pages themselves remain access-controlled, so this is not a page-access bypass.
Credits
This security vulnerability was found by @iRevivalx .
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-2026-107842 has been found in contao/core-bundle.
Attackers can target a specific entry point like ModuleSearch over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade contao/core-bundle to 5.7.12 or later.
If unsure, ask your IT team or search "contao/core-bundle CVE-2026-107842" on the vendor's site.
CVE-2026-107842 (contao/core-bundle) — CWE-200 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: ModuleSearch / contao.search.index_protected / tl_search
Patched: 5.7.12 — 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.
Information disclosure (CWE-200) exists in contao/core-bundle. Attackers reach the vulnerable code path via ModuleSearch without authentication.
Check the vendor advisory for the affected versions of contao/core-bundle. Attack surface: ModuleSearch / contao.search.index_protected / tl_search.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to 5.7.12.
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 'contao/core-bundle' . 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
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1Identify exposure identify
grep -r 'contao/core-bundle' . | 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
contao/core-bundle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 contao/core-bundle to 5.7.12ステージング環境で 5.7.12 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
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com