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CVE-2026-58587
medium
CVSS 6.1
Cross-Site Scripting (XSS) in drupal/canvas (CVE-2026-58587)
Summary
cross-site scripting in drupal/canvas (CVE-2026-58587). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `1.4.2, 1.5.2, 1.6.1, 1.7.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-58587** has been found in drupal/canvas.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade drupal/canvas to **1.4.2, 1.5.2, 1.6.1, 1.7.1** or later.
If unsure, ask your IT team or search "drupal/canvas CVE-2026-58587" on the vendor's site.
CVE-2026-58587 (drupal/canvas) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Patched: `1.4.2, 1.5.2, 1.6.1, 1.7.1` — 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
**Cross-site scripting (XSS)** (CWE-79) exists in drupal/canvas.
📍 Affected scope
drupal/canvas — .
🔥 Severity
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.4.2, 1.5.2, 1.6.1, 1.7.1**.
🛡️ 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 'drupal/canvas' .` 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
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1Identify exposure identify
grep -r 'drupal/canvas' . | 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 `drupal/canvas` 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 drupal/canvas to 1.4.2, 1.5.2, 1.6.1, 1.7.1ステージング環境で 1.4.2, 1.5.2, 1.6.1, 1.7.1 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
Packagist:https://packages.drupal.org/8
drupal/canvas
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.2"}],"database_specific":{"constraint":"<1.4.2"}},{"type":"ECOSYSTEM","events":[{"introduced":"1.5.0"},{"fixed":"1.5.2"}],"database_specific":{"constraint":">=1.5.0 <1.5.2"}},{"type":"ECOSYSTEM","events":[{"introduced":"1.6.0"},{"fixed":"1.6.1"}],"database_specific":{"constraint":">=1.6.0 <1.6.1"}},{"type":"ECOSYSTEM","events":[{"introduced":"1.7.0"},{"fixed":"1.7.1"}],"database_specific":{"constraint":">=1.7.0 <1.7.1"}}]