CVE-2026-35539

A flaw was found in Roundcube Webmail. This cross-site scripting XSS vulnerability arises from insufficient sanitization of HTML attachments when viewed in preview mode. A remote attacker could send a specially crafted HTML attachment, which, if previewed by a victim, could lead to the execution ...

CVE-2026-35540

A flaw was found in Roundcube Webmail. Insufficient sanitization of Cascading Style Sheets CSS in HTML e-mail messages may allow a remote attacker to perform Server-Side Request Forgery SSRF or disclose sensitive information. This can occur if malicious stylesheet links within an e-mail point to...

CVE-2026-35538

A flaw was found in Roundcube Webmail. Unsanitized IMAP SEARCH command arguments can be exploited by an attacker during mail search. This vulnerability could lead to IMAP injection, allowing an attacker to execute arbitrary IMAP commands, or a Cross-Site Request Forgery CSRF bypass, enabling...

CVE-2026-35541

A flaw was found in Roundcube Webmail. Incorrect password comparison within the password plugin can lead to a type confusion vulnerability. This allows an attacker to change a user's password without needing to know the old password, potentially leading to unauthorized access to the user's webmai...

CVE-2026-35537

A flaw was found in Roundcube Webmail. Unauthenticated attackers can exploit an unsafe deserialization vulnerability in the redis/memcache session handler. This allows for arbitrary file write operations by crafting malicious session data. The primary impact is the ability to write files to the...

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...

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...

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...

Incorrect Resource Transfer Between Spheres

Overview Affected versions of this package are vulnerable to Incorrect Resource Transfer Between Spheres in the processing of HTML email content when handling the background attribute of the BODY element. An attacker can cause information disclosure or bypass access controls by sending a speciall...

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,...

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...

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,...

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...

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...

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: 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...

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 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...

Roundcube Webmail: Unsanitized IMAP SEARCH command arguments

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsanitized IMAP SEARCH command arguments could lead to IMAP injection or CSRF bypass during mail search...

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...