---
id: "CVE-2017-16651"
kind: "vulnerability"
aliases: ["CVE-2017-16651"]
title: "Roundcube Roundcube Webmail: Roundcube Webmail File Disclosure Vulnerability"
severity: "high"
cvss: 7.8
epss: 0.45742
exploited: true
status: "open"
category: "package"
products: [{"name": "Roundcube Roundcube Webmail", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "package", "roundcube", "self-hosted", "webmail"]
not_affected_if: ["managed-hosting"]
published_at: "2017-11-09T14:29:00+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:34+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-16651", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2017-16651", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-16651", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Roundcube Roundcube Webmail: Roundcube Webmail File Disclosure Vulnerability

Roundcube Webmail, a web mail client, has a file disclosure flaw caused by weak input validation in its file-based attachment plugins, which are enabled by default. An attacker can read files on the server that the web mail process can access.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Roundcube Roundcube Webmail affected ? fixed ?

## Fix

Apply the vendor update per Roundcube's advisory; the fixed version is unknown from the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-16651
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2017-16651
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2017-16651

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_