Roundcube up to 1.6.16/1.7.1 TNEF decoder cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k1.99

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Roundcube up to 1.6.16/1.7.1. Affected by this issue is some unknown functionality of the component TNEF decoder. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-62641. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Roundcube up to 1.6.16/1.7.1. Affected by this vulnerability is an unknown functionality of the component TNEF decoder. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. The summary by CVE is:

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was subject to denial of service via a crafted compressed-RTF size.

It is possible to read the advisory at roundcube.net. This vulnerability is known as CVE-2026-62641 since 07/14/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. 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: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
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

07/14/2026 Advisory disclosed
07/14/2026 +0 days CVE reserved
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-2026-62641 (🔒)
GCVE (CVE): GCVE-0-2026-62641
GCVE (VulDB): GCVE-100-378379
CERT Bund: WID-SEC-2026-2207 - Roundcube: Mehrere Schwachstellen

Entryinfo

Created: 07/14/2026 19:01
Updated: 07/15/2026 05:11
Changes: 07/14/2026 19:01 (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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