{"id":"CVE-2023-26487","aliases":["GHSA-w5m3-xh75-mp55"],"url":"https://o3.security/vulnerability/CVE-2023-26487","summary":"Vega has cross-site scripting vulnerability in `lassoAppend` function","details":"Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs.`lassoAppend' function accepts 3 arguments and internally invokes `push` function on the 1st argument specifying array consisting of 2nd and 3rd arguments as `push` call argument. The type of the 1st argument is supposed to be an array, but it's not enforced. This makes it possible to specify any object with a `push` function as the 1st argument, `push` function can be set to any function that can be access via `event.view` (no all such functions can be exploited due to invalid context or signature, but some can, e.g. `console.log`). The issue is that`lassoAppend` doesn't enforce proper types of its arguments. This issue opens various XSS vectors, but exact impact and severity depends on the environment (e.g. Core JS `setImmediate` polyfill basically allows `eval`-like functionality). This issue was patched in 5.23.0.\n","published":"2023-03-03T23:47:28.486Z","modified":"2026-07-15T01:49:07.961944625Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"vega","fixedVersion":"5.23.0"},{"ecosystem":"npm","name":"vega-functions","fixedVersion":"5.13.1"}],"fix":{"url":"https://github.com/vega/vega/commit/01adb034f24727d3bb321bbbb6696a7f4cd91689","label":"vega/vega@01adb03"},"references":[{"type":"WEB","url":"https://github.com/vega/vega/releases/tag/v5.23.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26487.json"},{"type":"ADVISORY","url":"https://github.com/vega/vega/security/advisories/GHSA-w5m3-xh75-mp55"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-26487"},{"type":"FIX","url":"https://github.com/vega/vega/commit/01adb034f24727d3bb321bbbb6696a7f4cd91689"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:07.961944625Z"}}