{"id":"GHSA-rcw3-wmx7-cphr","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```","aliases":["CVE-2025-26619"],"modified":"2026-09-10T03:50:23.273639008Z","published":"2025-03-27T14:12:34Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2025-03-27T14:12:34Z","nvd_published_at":"2025-03-27T14:15:52Z","cwe_ids":["CWE-79"],"severity":"MODERATE"},"references":[{"type":"WEB","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":"WEB","url":"https://github.com/vega/vega-lite/issues/9469"},{"type":"WEB","url":"https://github.com/vega/vega/issues/3984"},{"type":"WEB","url":"https://github.com/vega/vega/commit/8fc129a6f8a11e96449c4ac0f63de0e5bfc7254c"},{"type":"PACKAGE","url":"https://github.com/vega/vega"}],"affected":[{"package":{"name":"vega","ecosystem":"npm","purl":"pkg:npm/vega"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.31.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-rcw3-wmx7-cphr/GHSA-rcw3-wmx7-cphr.json"}},{"package":{"name":"vega-functions","ecosystem":"npm","purl":"pkg:npm/vega-functions"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.16.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-rcw3-wmx7-cphr/GHSA-rcw3-wmx7-cphr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}