# CVE-2026-88859: Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-markup restriction

> Remote attackers can execute arbitrary JavaScript in Evolution by sending crafted emails with spoofed vCard controls, bypassing script restrictions.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L`)
- **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:** 10 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-88859, GHSA-8j98-q77q-pmv2, MGASA-2026-0554, UBUNTU-CVE-2026-88859

## What is CVE-2026-88859?

CVE-2026-88859 is a medium-severity cross-site scripting vulnerability in Red Hat Enterprise Linux 6, published on 10 Sep 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 flaw was found in Evolution. A remote attacker can exploit this vulnerability by sending a specially crafted HTML email containing a spoofed vCard control. When a victim clicks on this control, Evolution's trusted JavaScript handler incorrectly assigns an attacker-controlled JavaScript URL to an iframe's source. This action leads to arbitrary JavaScript execution within the mail-viewing context, effectively bypassing the security measures designed to prevent script execution in email content.

Weakness: CWE-84 (Improper Neutralization of Encoded URI Schemes in a Web Page)

## Which versions are affected by CVE-2026-88859?


## How do I fix CVE-2026-88859?

Apply the vendor's patch.

## Is CVE-2026-88859 being exploited?

There is no known exploitation of CVE-2026-88859 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88859 and fix it if it is affected.

What it is: CVE-2026-88859 is a medium-severity cross-site scripting vulnerability in Red Hat Enterprise Linux 6, published on 10 Sep 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-2026-88859 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 6. 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-2026-88859/ (Markdown: https://insights.sbomify.com/CVE-2026-88859/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88859
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88859
- OSV: https://osv.dev/vulnerability/CVE-2026-88859

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-88859/
Summaries are generated and may contain mistakes; the official description above is the record.