Vulnerability · Published Oct 22, 2026 · Assigned by mitre

CVE-2026-114725

Medium 5.0

In plain English

A medium-severity security flaw in Webmail from Roundcube. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.0Medium

Exploit odds (30 days)0.3%top 73.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	roundcube	no fix listed	DEBIAN-CVE-2026-114725
Debian:13	roundcube	1.6.20+dfsg-0+deb13u1	DEBIAN-CVE-2026-114725
Debian:14	roundcube	1.6.20+dfsg-1	DEBIAN-CVE-2026-114725
Ubuntu:26.10	roundcube	no fix listed	UBUNTU-CVE-2026-114725

Affected products (as reported)

Vendor	Product	Versions
Roundcube	Webmail	1.6.0 – before 1.6.201.7.0 – before 1.7.5

Weakness: CWE-99 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

References

https://bugs.debian.org/1151279 issue-tracking, third-party-advisory
https://github.com/roundcube/roundcubemail/commit/acd32a86f631dd6dcda8ac3ec7bd9ba4d4c0c117 patch
https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 vendor-advisory, release-notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 release-notes, patch
https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 release-notes, patch
https://github.com/roundcube/roundcubemail/commit/79adcfc0c48012bbbe930278471425027fd7331c patch