Roundcube up to 1.6.16/1.7.1 Attachment-Validation Warning Type cross site scripting

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.4$0-$5k1.99

Summaryinfo

A vulnerability categorized as problematic has been discovered in Roundcube up to 1.6.16/1.7.1. This affects an unknown function of the component Attachment-Validation Warning. Such manipulation of the argument Type leads to cross site scripting. This vulnerability is documented as CVE-2026-54432. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Roundcube up to 1.6.16/1.7.1. It has been rated as problematic. Affected by this issue is an unknown functionality of the component Attachment-Validation Warning. The manipulation of the argument type with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2 allows Stored Cross-Site Scripting (XSS). The issue occurs because the attachment MIME type is not properly escaped on the attachment-validation warning page.

The advisory is available at roundcube.net. This vulnerability is handled as CVE-2026-54432 since 06/15/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 1.6.17 or 1.7.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2207). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Fedora Linux
  • Open Source Roundcube

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: Roundcube 1.6.17/1.7.2

Timelineinfo

06/15/2026 CVE reserved
07/14/2026 +29 days Advisory disclosed
07/14/2026 +0 days VulDB entry created
07/15/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: roundcube.net
Status: Confirmed

CVE: CVE-2026-54432 (🔒)
GCVE (CVE): GCVE-0-2026-54432
GCVE (VulDB): GCVE-100-378386
CERT Bund: WID-SEC-2026-2207 - Roundcube: Mehrere Schwachstellen

Entryinfo

Created: 07/14/2026 19:11
Updated: 07/15/2026 05:11
Changes: 07/14/2026 19:11 (54), 07/15/2026 05:11 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!