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CVE-2026-8589
high
CVSS 7.3
Cross-Site Scripting (XSS) in gitlab (CVE-2026-8589)
Summary
cross-site scripting in gitlab (CVE-2026-8589). Confidential information can be exposed externally. Mitigation: upgrade to `18.10.8, 18.11.5, 19.0.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-8589** has been found in gitlab.
Confidential information can be exposed externally. CVSS score: 7.3/10.
What to do: upgrade gitlab to **18.10.8, 18.11.5, 19.0.2** or later.
If unsure, ask your IT team or search "gitlab CVE-2026-8589" on the vendor's site.
CVE-2026-8589 (gitlab) — CWE-79 / CVSS v3 7.3
Attack vector: remote (network-reachable)
Patched: `18.10.8, 18.11.5, 19.0.2` — 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
**Cross-site scripting (XSS)** (CWE-79) exists in gitlab.
📍 Affected scope
gitlab — .
🔥 Severity
Severity: High (CVSS 7.3/10). Confidential information can be exposed externally
🔧 How to fix
Update to **18.10.8, 18.11.5, 19.0.2**.
🛡️ 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 'gitlab' .` 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 'gitlab' . | 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 `gitlab` 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 gitlab to 18.10.8, 18.11.5, 19.0.2ステージング環境で 18.10.8, 18.11.5, 19.0.2 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
Bitnami
gitlab
[{"type":"SEMVER","events":[{"introduced":"13.1.4"},{"fixed":"18.10.8"},{"introduced":"18.11.0"},{"fixed":"18.11.5"},{"introduced":"19.0.0"},{"fixed":"19.0.2"}]}]
References
- web https://nvd.nist.gov/vuln/detail/CVE-2026-8589
- web https://hackerone.com/reports/3722842
- web https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released
- web https://gitlab.com/gitlab-org/gitlab/-/work_items/600099
- web https://github.com/advisories/GHSA-q9j8-24p8-jq8j
- web https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/