CVE-2026-8496

CVE Enrichment

CVSS: 6.1 MEDIUM
EPSS: 0.51%
EPSS Percentile: 41.39%
CISA KEV: Not listed

Description

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: cret@cert.org
Published: 14-May-2026 02:17
Last Modified: 07-Aug-2026 05:18
EPSS Date: 2026-10-10

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:R /
                            S:C /
                            C:L /
                            I:L /
                            A:N

References

Last enrichment sync: 11-Oct-2026 13:15
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

In March 2026, Proofpoint discovered TA458 exploiting a zero-day vulnerability in the SOGo webmail platform, which we reported to the vendor, Alinto; it was patched as CVE-2026-8496 in version 5.12.8. TA458 Uses Half-Click Webmail Exploits to Steal Email and Establish Persistent Access

CVE (6)

Malware (1)

Threat Actors (3)

MITRE ATT&CK (5)

Vendors (1)

Products (5)

Tools (1)

Industries (5)

Countries (5)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.