CVE-2025-26619Public exploitNetwork attack vector

Cross-site scripting via function-valued scale argument

Published Mar 27, 2025 · Updated Mar 27, 2025

Cross-site scripting in Vega 5.30.0 and earlier allows remote attackers to execute JavaScript through a crafted visualization. The scale expression helper accepts a function-valued first argument and invokes it unconditionally, letting an event filter pass event.view.setTimeout from the browser Window object. A victim must interact with a visualization built from an untrusted Vega specification, and deployments using the CSP-safe expression interpreter are unaffected.

CVSS severity5.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Vega 5.30.0 and earlier allows remote attackers to execute JavaScript through a crafted visualization. The scale expression helper accepts a function-valued first argument and invokes it unconditionally, letting an event filter pass event.view.setTimeout from the browser Window object. A victim must interact with a visualization built from an untrusted Vega specification, and deployments using the CSP-safe expression interpreter are unaffected.

The record

CVE
CVE-2025-26619
Published
Mar 27, 2025
Updated
Mar 27, 2025
Vendor
Vega
Product
Vega
Classifications
CWE-79, CAPEC-63, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.31.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vega · Vegaversion=< 5.31.0

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting (XSS)
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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