CVE WatchOct 22, 2026

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 newlin

CVSS

5.0

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Oct 22, 2026 · Last modified: Oct 22, 2026 · CWE-99

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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