# CVE-2025-66420: Tryton sao allows XSS via an HTML attachment

> An attacker can execute arbitrary scripts in the Tryton web client via malicious HTML attachments, potentially compromising user sessions.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 30 Nov 2025
- **Updated:** 1 Dec 2025
- **Also known as:** DEBIAN-CVE-2025-66420, DSA-6034-1, GHSA-xhgv-99mj-8m2x, UBUNTU-CVE-2025-66420

## What is CVE-2025-66420?

CVE-2025-66420 is a medium-severity cross-site scripting vulnerability in Tryton sao, published on 30 Nov 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Tryton sao (aka tryton-sao) before 7.6.9 allows XSS via an HTML attachment. This is fixed in 7.6.9, 7.4.19, 7.0.38, and 6.0.67.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-66420?

8 open source packages ship an affected version, including tryton-sao.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `tryton-sao` | npm | All versions | 6.0.67 |
| `tryton-sao` | npm | All versions | 6.0.67 |
| `tryton-sao` | npm | From 7.0.0 | 7.0.38 |
| `tryton-sao` | npm | From 7.0.0 | 7.0.38 |
| `tryton-sao` | npm | From 7.1.0 | 7.4.19 |
| `tryton-sao` | npm | From 7.1.0 | 7.4.19 |
| `tryton-sao` | npm | From 7.5.0 | 7.6.9 |
| `tryton-sao` | npm | From 7.5.0 | 7.6.9 |

## How do I fix CVE-2025-66420?

Upgrade tryton-sao to a fixed version for your release line: 6.0.67, 7.0.38, 7.4.19 or 7.6.9.

## Is CVE-2025-66420 being exploited?

There is no known exploitation of CVE-2025-66420 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66420 and fix it if it is affected.

What it is: CVE-2025-66420 is a medium-severity cross-site scripting vulnerability in Tryton sao, published on 30 Nov 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-66420 in the wild and no public exploit code.

Affected packages and fixed versions:
- tryton-sao (npm): affected all versions; fixed in 6.0.67
- tryton-sao (npm): affected all versions; fixed in 6.0.67
- tryton-sao (npm): affected from 7.0.0; fixed in 7.0.38
- tryton-sao (npm): affected from 7.0.0; fixed in 7.0.38
- tryton-sao (npm): affected from 7.1.0; fixed in 7.4.19
- tryton-sao (npm): affected from 7.1.0; fixed in 7.4.19
- tryton-sao (npm): affected from 7.5.0; fixed in 7.6.9
- tryton-sao (npm): affected from 7.5.0; fixed in 7.6.9

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-2025-66420/ (Markdown: https://insights.sbomify.com/CVE-2025-66420/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66420
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66420
- OSV: https://osv.dev/vulnerability/CVE-2025-66420

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66420/
Summaries are generated and may contain mistakes; the official description above is the record.