PT-2025-52760

Hackers Exploit List-Unsubscribe Header for XSS and SSRF Attacks The List-Unsubscribe SMTP header can be exploited for XSS and SSRF attacks if not properly validated. Examples include Horde Webmail CVE-2025-68673 allowing JavaScript URIs and Nextcloud Mail risking SSRF. Proper validation,...

Nextcloud: [nextcloud/mail] Blind SSRF to Internal Network via "List-Unsubscribe" SMTP Header when allow_local_remote_servers is allowed

Vulnerability description not provided...

Mail.ru: XSS в письме, в поле отправителя.

User-assisted XSS in message reading Unsubscribe feature via crafted List-Unsubscribe header in e.mail.ru Web mail interface...