# 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.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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:** Yes
- **Published:** 13 May 2026
- **Updated:** 6 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-8496, GHSA-5wp7-63mq-392x, UBUNTU-CVE-2026-8496

## 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.

## Is CVE-2026-8496 being exploited?

There is no known exploitation of CVE-2026-8496 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8496 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-8496 in the wild and no public exploit code.

Affected product: Alinto SOGo SOGo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8496/ (Markdown: https://insights.sbomify.com/CVE-2026-8496/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8496
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8496
- OSV: https://osv.dev/vulnerability/CVE-2026-8496

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-8496/
Summaries are generated and may contain mistakes; the official description above is the record.