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CVE-2026-27469
Vulnerability in isso (CVE-2026-27469)
Summary
vulnerability in isso (CVE-2026-27469). Risk of unauthorized operations or information disclosure. Exploitable via `PUT /id/`. Mitigation: upgrade to `0.13.2` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-27469** has been found in isso.
Attackers can target a specific entry point like `PUT /id/` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade isso to **0.13.2** or later.
If unsure, ask your IT team or search "isso CVE-2026-27469" on the vendor's site.
CVE-2026-27469 (isso) — CWE-116 /
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: PUT /id/ / POST /id/ / POST /new
Patched: `0.13.2` — 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
**A vulnerability** (CWE-116) exists in isso. Attackers reach the vulnerable code path via `PUT /id/` without authentication.
📍 Affected scope
isso — . Attack surface: PUT /id/ / POST /id/ / POST /new.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **0.13.2**.
🛡️ 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 `PUT /id/` requests with malformed payloads or SQL meta-characters. Run `grep -r 'isso' .` 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 'isso' . | 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 `isso` 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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3Hunt for indicators of compromise detect
grep 'PUT /id/' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `PUT /id/` 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。
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6Apply patch patch
Upgrade isso to 0.13.2ステージング環境で 0.13.2 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
Replay attack against PUT /id/ 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 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
PyPI
isso
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.2"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-27469
- advisory https://github.com/advisories/GHSA-9fww-8cpr-q66r
- package https://github.com/isso-comments/isso
- package https://pypi.org/project/isso
- web https://github.com/isso-comments/isso/security/advisories/GHSA-9fww-8cpr-q66r
- web https://github.com/isso-comments/isso/commit/0afbfe0691ee237963e8fb0b2ee01c9e55ca2144
- web https://docs.python.org/3/library/html.html#html.escape