Bug 2558714 (CVE-2026-114725)

Summary: CVE-2026-114725 roundcubemail: roundcubemail: Arbitrary mail header injection via unsanitized request parameters
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Roundcube Webmail. The application fails to properly sanitize newline characters in specific email header fields, including References, In-Reply-To, Message-ID, and From parameters. A remote authenticated attacker can exploit this vulnerability to inject arbitrary headers into outgoing emails, potentially enabling email spoofing or unauthorized manipulation of message routing.
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Bug Depends On: 2562379, 2562382    
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Description OSIDB Bzimport 2026-10-22 02:01:26 UTC 
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. Upstream fixed this in the commit “Fix mail header injection via References/In-Reply-To/Message-ID/From parameters”, which normalizes whitespace in every string header value.