Information Disclosure in Discourse (CVE-2026-72726)
Summary
Vulnerability in Discourse (CVE-2026-72726). Confidential information can be exposed externally. Mitigation: upgrade to 2026.1.6 or later.
Original description
The description as published by the source.
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, an authenticated user could eavesdrop on private AI bot conversations through the AI bot reply stream. The issue is fixed in 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
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-2026-72726 has been found in Discourse.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade Discourse to 2026.1.6 or later.
If unsure, ask your IT team or search "Discourse CVE-2026-72726" on the vendor's site.
CVE-2026-72726 (Discourse) — CWE-200 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Patched: 2026.1.6 — 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 Discourse.
Check the vendor advisory for the affected versions of Discourse.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 2026.1.6.
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 'Discourse' . 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 'Discourse' . | 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
Discourse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 Discourse to 2026.1.6ステージング環境で 2026.1.6 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
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web nvd.nist.gov