Roundcube up to 1.6.16/1.7.1 Email Message cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.4$0-$5k1.33

Summaryinfo

A vulnerability identified as problematic has been detected in Roundcube up to 1.6.16/1.7.1. This impacts an unknown function of the component Email Message Handler. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-54433. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in Roundcube up to 1.6.16/1.7.1. This affects some unknown functionality of the component Email Message Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. The summary by CVE is:

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a crafted plain-text email message. The attacker-controlled JavaScript executes within the victim's authenticated session simply by opening or previewing the message (zero-click).

It is possible to read the advisory at roundcube.net. This vulnerability is uniquely identified as CVE-2026-54433 since 06/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

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). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔒

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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-2026-54433 (🔒)
GCVE (CVE): GCVE-0-2026-54433
GCVE (VulDB): GCVE-100-378387
CERT Bund: WID-SEC-2026-2207 - Roundcube: Mehrere Schwachstellen

Entryinfo

Created: 07/14/2026 19:12
Updated: 07/15/2026 05:11
Changes: 07/14/2026 19:12 (53), 07/15/2026 05:11 (7)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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