Vulnerability Details CVE-2026-114725
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.1%
CVSS Severity
CVSS v3 Score 5.0
References
- https://bugs.debian.org/1151279
- https://github.com/roundcube/roundcubemail/commit/79adcfc0c48012bbbe930278471425027fd7331c
- https://github.com/roundcube/roundcubemail/commit/acd32a86f631dd6dcda8ac3ec7bd9ba4d4c0c117
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
Products affected by CVE-2026-114725
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cpe:2.3:a:roundcube:webmail:1.6.0
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cpe:2.3:a:roundcube:webmail:1.6.1
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cpe:2.3:a:roundcube:webmail:1.6.10
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cpe:2.3:a:roundcube:webmail:1.6.11
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cpe:2.3:a:roundcube:webmail:1.6.12
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cpe:2.3:a:roundcube:webmail:1.6.13
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cpe:2.3:a:roundcube:webmail:1.6.14
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cpe:2.3:a:roundcube:webmail:1.6.15
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cpe:2.3:a:roundcube:webmail:1.6.16
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cpe:2.3:a:roundcube:webmail:1.6.17
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cpe:2.3:a:roundcube:webmail:1.6.18
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cpe:2.3:a:roundcube:webmail:1.6.19
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cpe:2.3:a:roundcube:webmail:1.6.2
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cpe:2.3:a:roundcube:webmail:1.6.3
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cpe:2.3:a:roundcube:webmail:1.6.4
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cpe:2.3:a:roundcube:webmail:1.6.5
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cpe:2.3:a:roundcube:webmail:1.6.6
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cpe:2.3:a:roundcube:webmail:1.6.7
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cpe:2.3:a:roundcube:webmail:1.6.8
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cpe:2.3:a:roundcube:webmail:1.6.9
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cpe:2.3:a:roundcube:webmail:1.7.0
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cpe:2.3:a:roundcube:webmail:1.7.1
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cpe:2.3:a:roundcube:webmail:1.7.2
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cpe:2.3:a:roundcube:webmail:1.7.3
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cpe:2.3:a:roundcube:webmail:1.7.4