CVE-2017-16651
Roundcube Webmail contains a file disclosure vulnerability caused by insufficient input validation in conjunction with file-based attachment plugins, which are used by default.
Roundcube Webmail before 1.1.10, 1.2.x before 1.2.7, and 1.3.x before 1.3.3 allows unauthorized access to arbitrary files on the host's filesystem, including configuration files, as exploited in the wild in November 2017. The attacker must be able to authenticate at the target system with a valid username/password as the attack requires an active session. The issue is related to file-based attachment plugins and _task=settings&_action=upload-display&_from=timezone requests.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- packetstormsecurity.com/files/161226/Roundcube-Webmail-1.2-File-Disclosure.htmlExploitThird Party Advisory
- securityfocus.com/bid/101793Third Party AdvisoryVDB Entry
- github.com/roundcube/roundcubemail/issues/6026Issue TrackingPatch
- github.com/roundcube/roundcubemail/releases/tag/1.1.10Issue TrackingRelease Notes
- github.com/roundcube/roundcubemail/releases/tag/1.2.7Issue TrackingRelease Notes
- github.com/roundcube/roundcubemail/releases/tag/1.3.3Issue TrackingRelease Notes
- lists.debian.org/debian-lts-announce/2017/11/msg00039.htmlMailing ListThird Party Advisory
- roundcube.net/news/2017/11/08/security-updates-1.3.3-1.2.7-and-1.1.10Issue TrackingVendor Advisory
- debian.org/security/2017/dsa-4030Issue TrackingThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-16651US Government Resource
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1638 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 45.7% · top 1% of all CVEs
- Weakness
- CWE-552
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.