# CVE-2025-66420: tryton-sao XSS — Fixed in 7.6.9

📦

📦 npm

Not in CISA KEV

MEDIUM severity

# CVE-2025-66420 — tryton-sao

MEDIUM 

CVE-2025-66420 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in tryton-sao. A fix is available for tryton-sao — see the affected versions and patch details below.

Tryton sao allows XSS via an HTML attachment

Published

Nov 30, 2025

Updated

Dec 2, 2025

Affected

4 pkgs

Patched

4 / 4

Exploits

None indexed

Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

## Exploitation Status

### No confirmed exploitation observed yet

-   CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-66420.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk

0.00%0.23%0.45%0.68%0.0%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## How urgent is this, really

## Where this sits among everything scored

## Real-World Exposure

4 pkgs affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

`tryton-sao`npm

804downloads / week

## 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.

## Affected Packages

4 total 4 fixed

Ecosystem

Package

Vulnerable range

Fix

📦npm

`tryton-sao` 

≥ 7.5.0&&< 7.6.9

7.6.9`npm install tryton-sao@7.6.9`

📦npm

`tryton-sao` 

≥ 7.1.0&&< 7.4.19

7.4.19`npm install tryton-sao@7.4.19`

📦npm

`tryton-sao` 

≥ 7.0.0&&< 7.0.38

7.0.38`npm install tryton-sao@7.0.38`

📦npm

`tryton-sao` 

all versions

6.0.67`npm install tryton-sao@6.0.67`

## Detection & mitigation playbook

Open-source dependency

1.  ### Detect
    
    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tryton-sao, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Fix
    
    Update tryton-sao to 7.6.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-66420 is resolved across your whole dependency graph.
    
3.  ### Workarounds
    
    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
    

## Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

### Is CVE-2025-66420 in your dependencies?

Find it across npm, including transitive dependencies.

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