Roundcube Webmail vulnerabilities

Roundcube Webmail 1.1.x before 1.1.2 allows remote attackers to obtain sensitive information by reading files in the (1) config, (2) temp, or (3) logs directory.

Roundcube Webmail allows arbitrary password resets by authenticated users. This affects versions before 1.0.11, 1.1.x before 1.1.9, and 1.2.x before 1.2.5. The problem is caused by an improperly restricted exec call in the virtualmin and sasl drivers of the password plugin.

CVE-2016-4069 in Roundcube Webmail before version 1.1.5 has a cross-site request forgery (CSRF) vulnerability that allows remote attackers to hijack user authentication for requests that download attachments. This can lead to denial of service through unspecified vectors.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an improper authentication vulnerability in multi-host installations. When a user logs in with an alias address, rcube_user::query() matched the address against identity records without qualifying the lookup by IMAP host, so a login could be resolved to a user account belonging to a different IMAP host.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an uncontrolled resource consumption vulnerability in the CSS proxy (utils/modcss action). The fetched stylesheet was read into memory in full with no size limit and no read timeout, allowing server memory exhaustion via an attacker-controlled stylesheet URL.

Roundcube Webmail 1.6.14 before 1.6.20 and 1.7.0 before 1.7.5 is affected by a server-side request forgery filter bypass. The network blocklist used by rcube_utils::is_local_url() omitted the RFC 6052 NAT64 prefix 64:ff9b::/96, the RFC 8215 local-use NAT64 prefix 64:ff9b:1::/48, and the unspecified address ::/128, allowing URLs such as http://[64:ff9b::7f00:1]/ to reach loopback, link-local, and cloud metadata addresses.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a remote content blocking bypass. rcube_washtml inspected SVG SMIL animation attributes `to`, `from` and values for URIs, but not `by`; thus markup in an HTML message caused remote content to be loaded without the user's consent, disclosing the client IP address and confirming that the message was opened. Upstream fixed this in the commit “Fix remote-content blocker bypass via SVG SMIL `by` attribute”.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a remote content blocking bypass in the handling of FuncIRI attributes. rcube_washtml detected the CSS url() token with a pattern that enumerated only some of its escaped spellings, so values using other CSS escape sequences, for example \000075rl( or u\72 l(, were not recognized and remote content was loaded from an HTML message without the user's consent. Upstream fixed this in the commit “Fix remote content blocking bypass via CSS escapes in FuncIRI attributes (again)”, which resolves CSS escapes before matching and also inspects the `to`, `from` and `by` attributes.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 passes potentially unsafe content into ImageMagick when resizing images. SVG and EPS were accepted as valid image types for contact photo upload and can reference external resources and invoke ImageMagick delegates.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability in the Bounce (resend) action. rcube_mime::decode_address_list() did not strip control characters from the decoded display name, so a received message whose From display-name carries CRLF sequences in an encoded word could inject arbitrary headers into the message emitted when the user bounces it.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail stripped newline characters only from the Subject and Organization headers, leaving other header values taken from request parameters unsanitized, so a remote authenticated attacker could inject arbitrary headers into an outgoing message via the References, In-Reply-To, Message-ID and From parameters.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 contains an object injection primitive in rcube_session::unserialize(). A session key prefixed with “!” was treated as having no value, and the reconstructed serialized string was emitted with a key but no corresponding value, desynchronizing the remainder of the input so that following session data was interpreted as a serialized value. This yields a PHP object injection primitive for an attacker able to influence stored session data.

In Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5, ImageMagick resource limits can be bypassed during thumbnail generation. When rcube_image falls back to GD, the available-memory check was applied only on Windows, so on other platforms a crafted image with large dimensions was processed by GD without any resource limit and could exhaust server memory. The upstream fix applies the memory check on all platforms.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a selector boundary, leaving selectors after an at-rule unscoped and applied to the whole interface.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 allows the disabled_actions configuration setting to be bypassed. The check compared only the action name as requested, so a remote authenticated attacker could reach an action listed in disabled_actions by requesting it through its deprecated alias. The upstream fix moves the check into rcmail::action_handler() and resolves aliases before comparing.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an IMAP command injection vulnerability. A remote authenticated attacker can exploit this via CRLF sequences injected into the _flag parameter of the mail/mark action to execute arbitrary IMAP commands.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSRF validation bypass in the mark-as-junk action of the markasjunk plugin. The plugin read the _uid parameter from POST data but passed it to rcmail::get_uids() without constraining the input mode, so values re-read inside that helper could be taken from the query string and the action carried out without a valid CSRF token. The fix passes rcube_utils::INPUT_POST explicitly.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a cross-site scripting vulnerability in the password plugin. Error text returned by a password driver was concatenated into the message presented to the user without HTML escaping, so a backend able to influence that text, such as the DirectAdmin API, could inject script into the Roundcube interface.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability when a message is forwarded as an attachment. The subject of the forwarded message was used verbatim to generate the attachment name, so a received message whose subject contains CRLF sequences could inject arbitrary MIME part headers into the outgoing message.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail::extract_inline_images() used the media type taken from an inline image data URI without validating it, so a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Upstream fixed this in the commit “Fix mail header injection via media type in an inline image data URI”, which validates the media type with rcube_mime::is_mimetype_valid().

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an incorrect authorization vulnerability in the Modoboa driver of the password plugin. The driver took the first entry of the account search result returned by the Modoboa API instead of matching the authenticated user, so a password change could be applied to a different account.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a path traversal vulnerability in the squirrelmail_usercopy plugin. With the file-based backend, the source path was built from the login name without rejecting path separators, so a login name containing a slash could cause files outside the configured squirrelmail_data_dir to be read and imported.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by IMAP command injection. A remote authenticated attacker can exploit CRLF sequences injected into the _uid parameter of the mail/headers and mail/viewsource actions to execute arbitrary IMAP commands.

Roundcube Webmail before 1.6.18 and 1.7.3 has a vulnerability in the modoboa driver of the password plugin that could leak a Modoboa API authentication token to a user-controlled host via crafted session data. This affects only instances using the password plugin with the modoboa driver.

Roundcube Webmail before 1.6.18 and 1.7.3 is vulnerable to LDAP search filter injection via unescaped %u/%fu/%d substitution, which may lead to information disclosure or privilege escalation.

Roundcube Webmail before 1.6.18 and 1.7.3 has insufficient CSS sanitization in HTML emails, which may lead to SSRF or information disclosure, e.g., if stylesheet links point to local network hosts. This is due to incomplete fixes for CVE-2026-35540, CVE-2026-48843, and CVE-2026-62643.

Roundcube Webmail before 1.6.18 and 1.7.3 has improper rule name quoting that could lead to managesieve_disabled_actions setting bypass via a crafted rule name in a Sieve script. This affects only instances using the managesieve plugin.

Roundcube Webmail before 1.6.18 and 1.7.3 has an unclosed url() in a FuncIRI attribute of an SVG image that could evade remote image blocking, potentially leading to information disclosure or privilege escalation.

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, mail search and LITERAL+ byte-count desynchronization could lead to information disclosure or privilege escalation via IMAP command injection.

Roundcube Webmail before 1.6.18 and 1.7.3 has improper HTML/CSS sanitization of the SVG animate "by" attribute that may lead to remote image blocking bypass, potentially resulting in information disclosure or privilege escalation.

Roundcube Webmail before 1.6.18 and 1.7.3 is vulnerable to stored XSS in the "Add to address book" action.

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS proxy were not validated, which may result in information disclosure or XSS via MIME sniffing.

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.

In Roundcube Webmail before versions 1.6.17 and 1.7.x before 1.7.2, a stored Cross-Site Scripting (XSS) vulnerability exists via a crafted plain-text email message. The attacker-controlled JavaScript executes within the victim's authenticated session simply by opening or previewing the message (zero-click).

Roundcube Webmail before version 1.6.17 and 1.7.x before 1.7.2 is vulnerable to Stored Cross-Site Scripting (XSS). The issue occurs because the attachment MIME type is not properly escaped on the attachment-validation warning page.

The password plugin in Roundcube Webmail before versions 1.6.17 and 1.7.2 was vulnerable to username spoofing via session data, which could lead to account takeover.

In Roundcube Webmail before versions 1.6.17 and 1.7.2, insufficient CSS sanitization in HTML email messages may lead to SSRF or information disclosure when stylesheet links point to local network hosts.

In Roundcube Webmail before version 1.6.17 and 1.7.x before 1.7.2, an infinite loop was discovered in the TNEF decoder, which may lead to denial of service upon opening an email with a TNEF attachment.

In Roundcube Webmail before version 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was vulnerable to a denial of service (DoS) attack via a crafted compressed-RTF size.

In Roundcube Webmail 1.6.x before 1.6.16 and 1.7.x before 1.7.1, an unsanitized subject field in the draft restored value could lead to stored XSS/HTML/CSS injection on shared mailboxes.

Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7 have insufficient HTML sanitization that could lead to CSS injection via an SVG document with an animate element using the attributeName attribute.

Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1 allow pre-authentication arbitrary file deletion via Redis/Memcache session poisoning.

Vulnerability in Roundcube Webmail versions 1.6.x between 1.6.14 and 1.6.16 and 1.7.x before 1.7.1. Remote image blocking was not honored for URLs pointing to local/private destinations, potentially leading to information disclosure or privilege escalation via HTML email.

Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1 have insecure code evaluation logic in the LDAP autovalues option that could lead to code injection. Support for code evaluation has been removed in versions 1.6.16 and 1.7.1.

Roundcube Webmail versions 1.6.x between 1.6.14 and 1.6.16, and 1.7.x before 1.7.1 have insufficient CSS sanitization in HTML emails, which may lead to SSRF or information disclosure if stylesheet links point to local network hosts. The issue stems from an incomplete fix for CVE-2026-35540.

Roundcube Webmail versions 1.6.x before 1.6.16 and 1.7.x before 1.7.1 contain a pre-authentication SQL injection vulnerability in the virtuser_query plugin. The vulnerability is due to a backslash escape bypass in preg_replace().