Vulnerability · Published May 13, 2026 · Assigned by certcc
CVE-2026-8496A cross-site scripting (XSS) vulnerability in Alinto SOGo, version 5.12.7
Medium 6.1
In plain English
A medium-severity security flaw in SOGo from Alinto SOGo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | sogo | 5.8.0-2+deb12u3 | DEBIAN-CVE-2026-8496 |
| Debian:13 | sogo | 5.12.1-3+deb13u2 | DEBIAN-CVE-2026-8496 |
| Ubuntu:25.10 | sogo | no fix listed | UBUNTU-CVE-2026-8496 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Alinto SOGo | SOGo | 0 – before 5.12.8 |