What’s Vulnerable › Vulnerabilities

CVE-2026-8496: A cross-site scripting (XSS) vulnerability in Alinto SOGo, version 5.12.7

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-13 · updated 2026-10-26

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.

Affected products

• Alinto SOGo SOGo: before 5.12.8 — fixed in 5.12.8

How to fix

Upgrade to a fixed version: Alinto SOGo SOGo 5.12.8. Check the vendor advisory for mitigations.

References

• https://github.com/Alinto/sogo/commit/67ce01ec2a1a7854d8e9f615dd65afb949043e86
• https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.8
• https://www.sogo.nu/news/2026/sogo-v5128-released.html
• https://www.kb.cert.org/vuls/id/487613

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