Alinto SOGo up to 5.12.7 Webmail Interface Description cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in Alinto SOGo up to 5.12.7. Affected by this issue is some unknown functionality of the component Webmail Interface. Performing a manipulation of the argument Description results in cross site scripting. This vulnerability is known as CVE-2026-8496. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Alinto SOGo up to 5.12.7. It has been classified as problematic. This affects some unknown processing of the component Webmail Interface. The manipulation of the argument description 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:

A cross-site scripting (XSS) vulnerability exists in Alinto SOGo, version 5.12.7. A maliciously crafted ICS calendar invitation files allows arbitrary JavaScript execution within the authenticated SOGo webmail session. The issue occurs because SVG content embedded in the description field of an ICS file, with an onrepeat event handler, is insufficiently sanitized before being rendered in the webmail interface. A remote attacker can execute JavaScript in the victim's browser when the malicious calendar invite is viewed. Successful exploitation may allow mailbox access, email and contact theft, session hijacking, and other actions allowed by an authenticated user.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-8496 since 05/13/2026. 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. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 323707 (Debian dla-4657 : sogo - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.12.8 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (323707) and EUVD (EUVD-2026-30134). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Alinto

Name

• SOGo

Version

• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3
• 5.12.4
• 5.12.5
• 5.12.6
• 5.12.7

Website

• Product: https://github.com/Alinto/sogo/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion