CVE-2026-8496 A cross-site scripting (XSS) vulnerability in Alinto SOGo, version 5.12.7
Remote attackers can execute arbitrary JavaScript in victims' browsers via malicious ICS calendar invites, leading to session hijacking and data theft.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-8496?
CVE-2026-8496 is a medium-severity cross-site scripting vulnerability in Alinto SOGo SOGo, published on 13 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Which versions are affected by CVE-2026-8496?
How do I fix CVE-2026-8496?
Apply the vendor's patch.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-8496 being exploited?
There is no known exploitation of CVE-2026-8496 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-8496, GHSA-5wp7-63mq-392x, UBUNTU-CVE-2026-8496.