# CVE-2026-120331: Server-Side Request Forgery in extension "Mail" (mail)

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

Content of external URL mails, their stylesheets and images to embed is fetched by the server without validating the target host. Backend users with access to the mail module can make the server send requests to hosts in the internal network.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- TYPO3 / Extension "Mail" (mediaessenz/mail): ≥ 4.0.0; < 4.2.0 (affected, semver); ≥ 0; < 3.12.5 (affected, semver). Source: CNA: TYPO3

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N; source: CNA: TYPO3

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: f4fb688c-4412-4426-b4b8-421ecf27b14a

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-918

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://typo3.org/security/advisory/typo3-ext-sa-2026-037 (CNA: TYPO3; vendor-advisory)

- https://typo3.org/security/advisory/typo3-ext-sa-2026-037 (f4fb688c-4412-4426-b4b8-421ecf27b14a)

## Provenance

- CNA: TYPO3: https://www.cve.org/CVERecord?id=CVE-2026-120331; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120331; retrieved 2026-11-03; source updated 2026-11-03

Revision: 5c2db72b9c2e80d11eb28c69a74fc11cfd5367a4c13b96e43a283d8248c71881

Canonical: https://y2.dev/cve/CVE-2026-120331

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.