CVE-2025-26619: Vega Cross-Site Scripting (XSS) via event filter when not using CSP mode `expressionInterpeter`

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-03-27 · updated 2026-06-17
Weakness: CWE-79

Description

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. In `vega` 5.30.0 and lower and in `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. The issue is patched in `vega` `5.31.0` and `vega-functions` `5.16.0`. Some workarounds are available. Run `vega` without `vega.expressionInterpreter`. This mode is not the default as it is slower. Alternatively, using the interpreter described in CSP safe mode (Content Security Policy) prevents arbitrary Javascript from running, so users of this mode are not affected by this vulnerability.

Affected products

Vega-Functions Project Vega-Functions: before 5.16.0 — fixed in 5.16.0
vega: before 5.31.0 — fixed in 5.31.0

How to fix

Upgrade to a fixed version: Vega-Functions Project Vega-Functions 5.16.0; vega 5.31.0. Check the vendor advisory for mitigations.

References

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