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CVE-2025-66648

Vega-functions cross-site scripting (XSS)

7.2 HIGHPublic exploitEPSS 0.23%
  1. Published5 Jan 2026

Description

vega-functions provides function implementations for the Vega expression language. Prior to version 6.1.1, for sites that allow users to supply untrusted user input, malicious use of an internal function (not part of the public API) could be used to run unintentional javascript (XSS). This issue is fixed in vega-functions `6.1.1`. There is no workaround besides upgrading. Using `vega.expressionInterpreter` as described in CSP safe mode does not prevent this issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

Vega-functions< 6.1.1

Remediation

Fixed in
Vega-functions≥ 6.1.1

References

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Frequently asked

Is CVE-2025-66648 being actively exploited?

CVE-2025-66648 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.23%.

How severe is CVE-2025-66648?

CVE-2025-66648 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 0.23% probability of exploitation.

Which products are affected by CVE-2025-66648?

Affected products include Vega-functions.

How do I fix CVE-2025-66648?

Upgrade affected software to a fixed version, for example Vega-functions 6.1.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.