Security update for roundcubemail
Published Sources: OSV
What is affected, what to do
This update for roundcubemail fixes the following issues: Changes in roundcubemail: Update to 1.6.20: This is a security update to the version 1.6 of Roundcube Webmail. It provides fixes to recently reported security vulnerabilities: + Fix IMAP command injection via CRLF in _uid parameter of mail/headers and mail/viewsource action, reported by Wahab "NeoX" K. + Fix bug where an alias login wasn't qualified by IMAP host, reported by Milan Hoppe. + Add a size limit to the CSS proxy content processing, reported by Milan Hoppe. + Fix SSRF filter (is_local_url()) bypass via NAT64 64:ff9b::/96, reported by dizconnect. + Fix remote content blocking bypass via SVG SMIL by attribute, reported by Milan Hoppe. + Fix remote content blocking bypass via CSS escapes in FuncIRI attributes (again), reported by Milan Hoppe. + Fix passing potentally unsafe attachment content into ImageMagick on image resize, reported by Paulos Yibelo + Fix mail header injection via the From display-name in the Bounce (resend) action, reported by Clay. + Fix mail header injection via References/In-Reply-To/Message-ID/From parameters, reported by Sunil Tripathy. + Fix object injection primitive in rcube_session::unserialize() via "!"-prefixed session keys, reported by Oli Z. + Fix ImageMagick resource limits bypass by GD fallback during thumbnail generation, reported by GoldenSW. + Fix CSS scoping bypass in HTML messages using at-rules, reported by GoldenSW. + Fix bug where deprecated action aliases bypassed disabled_actions setting, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix IMAP command injection via CRLF in _flag parameter of mail/mark action, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix CSRF validation bypass in the mark-as-junk action, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix XSS issue in handling of password driver error responses, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix mail header injection via subject of a message forwarded as attachment, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix mail header injection via media type in an inline image data URI, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix bug where Password Modoboa driver could change password for another account, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix unsafe use of a login name in SquirrelMail import file path, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5.
The available sources name no fixed version. Check the vendor guidance in the references below.
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Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 30.00 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
This update for roundcubemail fixes the following issues: Changes in roundcubemail: Update to 1.6.20: This is a security update to the version 1.6 of Roundcube Webmail. It provides fixes to recently reported security vulnerabilities: + Fix IMAP command injection via CRLF in _uid parameter of mail/headers and mail/viewsource action, reported by Wahab "NeoX" K. + Fix bug where an alias login wasn't qualified by IMAP host, reported by Milan Hoppe. + Add a size limit to the CSS proxy content processing, reported by Milan Hoppe. + Fix SSRF filter (is_local_url()) bypass via NAT64 64:ff9b::/96, reported by dizconnect. + Fix remote content blocking bypass via SVG SMIL by attribute, reported by Milan Hoppe. + Fix remote content blocking bypass via CSS escapes in FuncIRI attributes (again), reported by Milan Hoppe. + Fix passing potentally unsafe attachment content into ImageMagick on image resize, reported by Paulos Yibelo + Fix mail header injection via the From display-name in the Bounce (resend) action, reported by Clay. + Fix mail header injection via References/In-Reply-To/Message-ID/From parameters, reported by Sunil Tripathy. + Fix object injection primitive in rcube_session::unserialize() via "!"-prefixed session keys, reported by Oli Z. + Fix ImageMagick resource limits bypass by GD fallback during thumbnail generation, reported by GoldenSW. + Fix CSS scoping bypass in HTML messages using at-rules, reported by GoldenSW. + Fix bug where deprecated action aliases bypassed disabled_actions setting, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix IMAP command injection via CRLF in _flag parameter of mail/mark action, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix CSRF validation bypass in the mark-as-junk action, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix XSS issue in handling of password driver error responses, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix mail header injection via subject of a message forwarded as attachment, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix mail header injection via media type in an inline image data URI, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix bug where Password Modoboa driver could change password for another account, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. + Fix unsafe use of a login name in SquirrelMail import file path, reported by Squirt1e, Atum, N0b0dy, and Gh0u1L5. This version is considered stable and we recommend to update all productive installations of Roundcube with it. Please do backup your data before updating! Update to 1.6.19: This is a security update to the version 1.6 of Roundcube Webmail. It provides fixes to recently reported security vulnerabilities: + Fix CSS declaration smuggling via un-encoded ampersand emission, reported by Zach Hanley of Horizon3.ai + Fix CSS property injection via body background attribute, reported by zenithhostingevan + Fix email header injection via bare CR in the subject field, reported by CVE-Hunter-Leo + Fix email header injection via C-escape \r in the recipient display name, reported by dogeshark + Fix email header injection via identity's organization field, reported by dogeshark + Fix zero-click stored XSS via TNEF MIME tag injection in the attachment URL, reported by nakko + Fix XSS in the HTML editor using text/enriched part content, reported by Joshua Rogers + Fix cross-user access in contact group membership (add/remove) in the SQL address book, reported by Joshua Rogers + Fix is_local_url() bypass via trailing-dot FQDN in stylesheet URL, reported by nept1337 + Fix remote content blocking bypass via CSS escapes in FuncIRI attributes, reported by neoxed + Fix remote-content blocker bypass via SVG SMIL src animation + Fix SSRF bypass in Roundcube CSS proxy via hexadecimal IPv6-mapped IPv4 addresses, reported by faceless0x7 and Harish Annavisamy This version is considered stable and we recommend to update all productive installations of Roundcube with it. Please do backup your data before updating! Update to 1.6.18 [boo#1275552]: + Password: Fix fatal error "Class 'Zxcvbn' not found" (#10274) + Fix out-of-bounds string reads on truncated compressed-RTF in the TNEF decoder (#10269) + Security: Add basic validation for content proxied by the css proxy [CVE-2026-74998] [boo#1275324] + Security: Fix SSRF bypass via specific local address URLs using 100.64.0.0/10 and fe80::/10 nets [CVE-2026-75006] [boo#1275319] + Security: Fix SSRF filter bypass via various forms of nip.io/sslip.io hostnames evading is_local_url() check [CVE-2026-75006] [boo#1275319] + Security: Fix remote content blocking bypass via unclosed url() in a FuncIRI attribute [CVE-2026-75003] [boo#1275320] + Security: Fix LDAP filter injection via unescaped %u/%fu/%d substitution into the search_filter [CVE-2026-75007] [boo#1275318] + Security: Fix arbitrary Sieve script injection via a filter rule name bypassing managesieve_disabled_actions [CVE-2026-75004] [boo#1275445] + Security: Fix RCE via cmd_learn driver of markasjunk plugin [CVE-2026-74997] [boo#1275325] + Security: Fix IMAP command injection via mail search and LITERAL+ byte-count desynchronization [CVE-2026-75002] [boo#1275321] + Security: Fix password's modoboa driver leak of an authentication token to a user-controlled host [CVE-2026-75010] [boo#1275317] + Security: Fix stored XSS in "Add to address book" action [CVE-2026-74999] [boo#1275323] + Security: Fix HTML/CSS sanitization bypass via SVG animate by attribute [CVE-2026-75000] [boo#1275322] Update to 1.6.17: + Enigma: Support automatic public key lookup (import) using HKP v1 protocol (#5314) + Enigma: Kolab WOAT Support (#8626) + Security: Fix an infinite loop in TNEF (winmail.dat) decoder (#10193) [CVE-2026-62642] [boo#1271475] + Security: Fix various vulnerabilities in the password plugin using session-injected username [CVE-2026-62644] [boo#1271474] + Security: Fix stored XSS via unescaped attachment MIME type on the attachment-validation warning page [CVE-2026-54432] [boo#1271471] + Security: Fix SSRF bypass via specific local address URLs - two new cases [CVE-2026-62643] [boo#1271477] + Security: Fix zero-click stored XSS in plain-text rendering [CVE-2026-54433] [boo#1271472] + Security: Fix DoS via crafted compressed-RTF size in the TNEF (winmail.dat) file [CVE-2026-62641] [boo#1271476] Additional references added to older update: (bsc#1243915, CVE-2025-49113)