Unrestricted File Upload in @backstage/plugin-techdocs (CVE-2021-32661)
Summary
Vulnerability in @backstage/plugin-techdocs (CVE-2021-32661). Successful exploitation can lead to full system takeover. Exploitable via object. Mitigation: upgrade to 0.9.5 or later.
Original description
The description as published by the source.
Impact
A malicious internal actor can potentially upload documentation content with malicious scripts by embedding the script within an object element. This may give access to sensitive data when other users visit that same documentation page.
The ability to upload malicious content may be limited by internal code review processes, unless the chosen TechDocs deployment method is to use an object store and the actor has access to upload files directly to that store.
Patches
The vulnerability is patched in the 0.9.5 release of @backstage/plugin-techdocs.
For more information
If you have any questions or comments about this advisory:
- Open an issue in the Backstage repository
- Visit our chat, linked to in Backstage README
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
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-2021-32661 has been found in @backstage/plugin-techdocs.
Attackers can target a specific entry point like object over the network to misuse the product.
Successful exploitation can lead to full system takeover.
What to do: upgrade @backstage/plugin-techdocs to 0.9.5 or later.
If unsure, ask your IT team or search "@backstage/plugin-techdocs CVE-2021-32661" on the vendor's site.
CVE-2021-32661 (@backstage/plugin-techdocs) — CWE-434
Attack vector: remote (network-reachable)
Attack surface: object
Patched: 0.9.5 — 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-434) exists in @backstage/plugin-techdocs. Attackers reach the vulnerable code path via object.
Check the vendor advisory for the affected versions of @backstage/plugin-techdocs. Attack surface: object.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 0.9.5.
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 '@backstage/plugin-techdocs' . 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 '@backstage/plugin-techdocs' . | 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
@backstage/plugin-techdocs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 @backstage/plugin-techdocs to 0.9.5ステージング環境で 0.9.5 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
- advisory nvd.nist.gov
- web github.com
- web github.com
- web github.com