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CVE-2026-55824
low
CVSS 2.6
Information Disclosure in contao/contao (CVE-2026-55824)
Summary
vulnerability in contao/contao (CVE-2026-55824). Risk of unauthorized operations or information disclosure. Exploitable via ``Cookie``. Mitigation: upgrade to `5.7.7` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-55824** has been found in contao/contao.
Attackers can target a specific entry point like ``Cookie`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 2.6/10.
What to do: upgrade contao/contao to **5.7.7** or later.
If unsure, ask your IT team or search "contao/contao CVE-2026-55824" on the vendor's site.
CVE-2026-55824 (contao/contao) — CWE-200 / CVSS v3 2.6
Attack vector: remote (network-reachable)
Attack surface: `Cookie` / `Authorization` / `basic_auth` / `bearer_auth`
Patched: `5.7.7` — 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
**information disclosure** (CWE-200) exists in contao/contao. Attackers reach the vulnerable code path via ``Cookie`` without authentication.
📍 Affected scope
contao/contao — . Attack surface: `Cookie` / `Authorization` / `basic_auth` / `bearer_auth`.
🔥 Severity
Severity: Low (CVSS 2.6/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.7.7**.
🛡️ 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 'contao/contao' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'contao/contao' . | 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/contao` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade contao/contao to 5.7.7ステージング環境で 5.7.7 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
composer
contao/contao
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.7"}]}]
composer
contao/core-bundle
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7.7"}]}]
References
- web https://github.com/contao/contao/security/advisories/GHSA-3mr9-p497-58f6
- web https://nvd.nist.gov/vuln/detail/CVE-2026-55824
- web https://github.com/contao/contao/commit/5bc6e3f900c439313df57aa561d0865792aafa05
- web https://github.com/contao/contao/commit/80425d28cdf66280a209bd3f5bc31b1a76901a04
- web https://contao.org/en/security-advisories/credentials-disclosure-in-the-crawler
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/contao/CVE-2026-55824.yaml
- web https://github.com/FriendsOfPHP/security-advisories/blob/master/contao/core-bundle/CVE-2026-55824.yaml
- web https://github.com/advisories/GHSA-3mr9-p497-58f6