CVE-2026-74999
Received Received - Intake

Stored XSS in Roundcube Webmail

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: MITRE

Description
In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the "Add to address book" action was subject to stored XSS.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-17
Last Modified
2026-08-17
Generated
2026-08-17
AI Q&A
2026-08-17
EPSS Evaluated
N/A
NVD
CVE-2026-74999
EUVD
EUVD-2026-60166

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
roundcube roundcube to 1.6.18 (exc)
roundcube roundcube From 1.7.0 (inc) to 1.7.3 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is a stored cross-site scripting (XSS) issue in Roundcube Webmail versions before 1.6.18 and 1.7.x before 1.7.3. It allows attackers to inject malicious scripts into the 'Add to address book' functionality, which are then stored and executed when other users view the affected content.

Detection Guidance

To detect this vulnerability, inspect Roundcube Webmail versions. Check if the installed version is before 1.6.18 or 1.7.x before 1.7.3. Use commands like 'grep -r "Roundcube" /var/www/' or check version via 'cat /var/www/roundcube/program/include/iniset.php | grep "VERSION"'.

Impact Analysis

This vulnerability could allow attackers to steal user sessions, perform actions on behalf of users, or deface the webmail interface. Users of vulnerable Roundcube versions may have their data compromised or be exposed to further attacks through malicious scripts.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using vulnerable versions may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Upgrade Roundcube Webmail to version 1.6.18 or later, or 1.7.3 or later. Remove untrusted entries from the address book manually if stored XSS is suspected. Monitor for unusual activity in webmail logs.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-74999. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart