Vulnerability in typo3/cms-form (CVE-2026-15305)
Summary
Vulnerability in typo3/cms-form (CVE-2026-15305). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 14.3.5 or later.
Original description
The description as published by the source.
Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline. This issue affects TYPO3 CMS versions 14.2.0-14.3.4.
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-2026-15305 has been found in typo3/cms-form.
Risk of unauthorized operations or information disclosure.
What to do: upgrade typo3/cms-form to 14.3.5 or later.
If unsure, ask your IT team or search "typo3/cms-form CVE-2026-15305" on the vendor's site.
CVE-2026-15305 (typo3/cms-form) — CWE-351
Patched: 14.3.5 — 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-351) exists in typo3/cms-form.
Check the vendor advisory for the affected versions of typo3/cms-form.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 14.3.5.
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 'typo3/cms-form' . 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 'typo3/cms-form' . | 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
typo3/cms-form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 typo3/cms-form to 14.3.5ステージング環境で 14.3.5 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 typo3.org
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- web github.com
- web github.com
- web news.typo3.com
- web github.com
- web github.com
- web packagist.org