What’s Vulnerable › Vulnerabilities
CVE-2019-10740
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2019-04-07 · updated 2026-06-17
- Weakness: CWE-319
Description
In Roundcube Webmail before 1.3.10, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.
Affected products
- Fedoraproject Fedora: 29
- openSUSE Backports Sle: 15.0-sp1, 15.0-sp2
- openSUSE Leap: 15.1, 15.2
- Roundcube Webmail: before 1.3.10 — fixed in 1.3.10
How to fix
Upgrade to a fixed version: Roundcube Webmail 1.3.10. Check the vendor advisory for mitigations.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00083.html
- https://github.com/roundcube/roundcubemail/issues/6638
- https://github.com/roundcube/roundcubemail/releases/tag/1.3.10
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFFMSO5WKEYSGMTZPZFF4ZADUJ57PRN5/
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00083.html
- https://github.com/roundcube/roundcubemail/issues/6638
- https://github.com/roundcube/roundcubemail/releases/tag/1.3.10
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFFMSO5WKEYSGMTZPZFF4ZADUJ57PRN5/
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