EUVD-2026-18591

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets CSS sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important...

EUVD-2026-18583

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets CSS sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts...

EUVD-2026-18593

An issue was discovered in Roundcube Webmail before 1.5.15 and 1.6.15. The remote image blocking feature can be bypassed via SVG content in an e-mail message. This may lead to information disclosure or access-control bypass. This involves the animate element with attributeName=fill/filter/stroke...

Incorrect Resource Transfer Between Spheres

Overview Affected versions of this package are vulnerable to Incorrect Resource Transfer Between Spheres in the CSS sanitization process for HTML email messages. An attacker can inject malicious CSS by crafting specially formatted HTML emails that exploit the lack of proper sanitization,...

Incorrect Resource Transfer Between Spheres

Overview Affected versions of this package are vulnerable to Incorrect Resource Transfer Between Spheres in the remote image blocking process. An attacker can obtain sensitive information or bypass access controls by embedding specially crafted SVG content with animate attributes in an email...

Incorrect Resource Transfer Between Spheres

Overview Affected versions of this package are vulnerable to Incorrect Resource Transfer Between Spheres in the remote image blocking process. An attacker can cause unauthorized remote image loading by embedding specially crafted SVG content with animate elements using attributes such as fill,...

Server-side Request Forgery (SSRF)

Overview Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the processing of HTML e-mail messages due to insufficient sanitization of CSS. An attacker can access sensitive information or interact with internal network resources by embedding malicious styleshe...

Access of Resource Using Incompatible Type ('Type Confusion')

Overview Affected versions of this package are vulnerable to Access of Resource Using Incompatible Type 'Type Confusion' due to incorrect comparison in the password plugin. An attacker can change a user's password without knowing the original password by exploiting type confusion during the...

Arbitrary Argument Injection

Overview Affected versions of this package are vulnerable to Arbitrary Argument Injection via unsanitized arguments in the SEARCH process. An attacker can manipulate IMAP commands or bypass cross-site request forgery protections by supplying crafted input to the mail search functionality...

GHSA-X4Q5-8J5G-HPJC Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment...

GHSA-J2G6-8RVG-7MF6 Roundcube Webmail: Bypass of remote image blocking via SVG content (with animate attributes) in an e-mail message

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via SVG content with animate attributes in an e-mail message. This may lead to information disclosure or access-control bypass...

GHSA-W846-74JR-76CV Roundcube Webmail: Remote image blocking feature can be bypassed via SVG content in an e-mail message

An issue was discovered in Roundcube Webmail before 1.5.15 and 1.6.15. The remote image blocking feature can be bypassed via SVG content in an e-mail message. This may lead to information disclosure or access-control bypass. This involves the animate element with attributeName=fill/filter/stroke...

Deserialization of Untrusted Data

Overview Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the session handler for redis and memcache. An attacker can perform arbitrary file write operations by submitting crafted session data. Details Serialization is a process of converting an object into...

GHSA-VXG2-HHGR-37FX Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets CSS sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts...

Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment...

Roundcube Webmail: Unsafe deserialization in the redis/memcache session handler

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data...

Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets CSS sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important...

Roundcube: Bypass of remote image blocking via crafted BODY background attribute

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via a crafted background attribute of a BODY element in an e-mail message. This may lead to information disclosure or access-control bypass...

Roundcube Webmail: Bypass of remote image blocking via SVG content (with animate attributes) in an e-mail message

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. The remote image blocking feature can be bypassed via SVG content with animate attributes in an e-mail message. This may lead to information disclosure or access-control bypass...

Roundcube Webmail: Incorrect password comparison in the password plugin

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Incorrect password comparison in the password plugin could lead to type confusion that allows a password change without knowing the old password...