CVE-2026-114716

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{"bugzilla": {"description": "roundcubemail: roundcubemail: Mail header injection via unvalidated inline image media type", "id": "2558658", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558658"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N", "status": "draft"}, "cwe": "CWE-93", "details": ["Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability. rcmail_sendmail::extract_inline_images() used the media type taken from an inline image data URI without validating it, so a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Upstream fixed this in the commit \u201cFix mail header injection via media type in an inline image data URI\u201d, which validates the media type with rcube_mime::is_mimetype_valid().", "A flaw was found in Roundcube Webmail. The application does not properly validate media type values extracted from inline image data URIs when preparing outgoing messages. A remote authenticated attacker can exploit this vulnerability by submitting specially crafted messages with newline characters in the media type, allowing them to inject arbitrary Multipurpose Internet Mail Extensions (MIME) headers into outgoing emails. This issue can enable an attacker to tamper with message structure, manipulate recipients, or evade security filters."], "name": "CVE-2026-114716", "public_date": "2026-10-22T01:17:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-114716\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-114716\nhttps://bugs.debian.org/1151279\nhttps://github.com/roundcube/roundcubemail/commit/7f3cc9cacb16cb3ab047fe8e3cba81db2023cdfc\nhttps://github.com/roundcube/roundcubemail/commit/adb9b9b3fd43e30af1c166b79494726d89f828eb\nhttps://github.com/roundcube/roundcubemail/releases/tag/1.6.20\nhttps://github.com/roundcube/roundcubemail/releases/tag/1.7.5\nhttps://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5"], "statement": "This vulnerability is rated as an Important severity flaw because authenticated attackers can inject arbitrary MIME headers into outgoing messages, potentially subverting mail filtering controls or tampering with delivery routing. Within the Red Hat ecosystem, Roundcube Webmail is not included with supported Red Hat Enterprise Linux releases and is maintained only in the Extra Packages for Enterprise Linux (EPEL) community repository. Successful exploitation requires valid user authentication to the webmail interface to submit crafted inline image metadata, restricting exposure to authorized accounts.", "threat_severity": "Important"}

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