CVE-2026-120329 PUBLISHED

Broken Access Control in extension "Mail" (mail)

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

Saving the configuration of the mail backend module writes submitted settings to the page TSconfig without restricting them to the configuration options of the module. Backend users with access to the mail module can write arbitrary page TSconfig.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	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-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE