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

CVE-2026-8496 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-8496, released May 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-8496
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 13, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | sogo Debian 12.15 (bookworm) | 5.8.0-2+deb12u3 | [DEBIAN-CVE-2026-8496](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8496.md) | May 13, 2026 |
| Linux | sogo Debian 13.5 (trixie) | 5.12.1-3+deb13u2 | [DEBIAN-CVE-2026-8496](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8496.md) | May 13, 2026 |
| Linux | sogo Ubuntu 26.04.1 LTS (resolute) | 5.12.4-1.2ubuntu0.1~esm1 | [sogo 5.12.4-1.2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-sogo-5.12.4-1.2ubuntu0.1-esm1.md) | May 18, 2026 |
| Linux | sogo-activesync Ubuntu 26.04.1 LTS (resolute) | 5.12.4-1.2ubuntu0.1~esm1 | [sogo-activesync 5.12.4-1.2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-sogo-activesync-5.12.4-1.2ubuntu0.1-esm1.md) | May 18, 2026 |
| Linux | sogo-common Ubuntu 26.04.1 LTS (resolute) | 5.12.4-1.2ubuntu0.1~esm1 | [sogo-common 5.12.4-1.2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-sogo-common-5.12.4-1.2ubuntu0.1-esm1.md) | May 18, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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