CVE-2026-120331 PUBLISHED

Server-Side Request Forgery in extension "Mail" (mail)

Assigner: TYPO3
Reserved: 01.11.2026 Published: 03.11.2026 Updated: 03.11.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	TYPO3
Product	Extension "Mail"
Versions	Default: unaffected affected from 4.0.0 to 4.2.0 (excl.) affected from 0 to 3.12.5 (excl.)

Credits

Alexander Grein reporter
Alexander Grein remediation developer

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-037

Problem Types

CWE-918 Server-Side Request Forgery (SSRF) CWE