Vulnerability in Zammad (CVE-2026-34837)
Summary
Vulnerability in Zammad (CVE-2026-34837). Risk of unauthorized operations or information disclosure. Exploitable via POST /api/v1/ai_assistance/text_tools/. Mitigation: upgrade to 7.0.1 or later.
Original description
The description as published by the source.
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, he REST endpoint POST /api/v1/ai_assistance/text_tools/:id contains an authorization failure. Context data (e.g., a group or organization) supplied to be used in the AI prompt were not checked if they are accessible for the current user. This leads to having data present in the AI prompt that were not authorized before being used. A user needs to have ticket.agent permission to be able to use the provided context data. This vulnerability is fixed in 7.0.1.
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-2026-34837 has been found in Zammad.
Attackers can target a specific entry point like POST /api/v1/ai_assistance/text_tools/ over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade Zammad to 7.0.1 or later.
If unsure, ask your IT team or search "Zammad CVE-2026-34837" on the vendor's site.
CVE-2026-34837 (Zammad) — CWE-862 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Attack surface: POST /api/v1/ai_assistance/text_tools/
Patched: 7.0.1 — 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.
A vulnerability (CWE-862) exists in Zammad. Attackers reach the vulnerable code path via POST /api/v1/ai_assistance/text_tools/.
Check the vendor advisory for the affected versions of Zammad. Attack surface: POST /api/v1/ai_assistance/text_tools/.
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure.
Update to 7.0.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /api/v1/ai_assistance/text_tools/ requests with malformed payloads or SQL meta-characters. Run grep -r 'Zammad' . 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
-
1Identify exposure identify
grep -r 'Zammad' . | 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
Zammadを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'POST /api/v1/ai_assistance/text_tools/' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /api/v1/ai_assistance/text_tools/への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply patch patch
Upgrade Zammad to 7.0.1ステージング環境で 7.0.1 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 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against POST /api/v1/ai_assistance/text_tools/ on staging to confirm patch closes the vector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 2 と同じログクエリでアラート再発が無いか継続監視。
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov