Which versions of Vega Functions are affected by CVE-2025-26619?

Organizations using Vega should be aware of moderate risk from CVE-2025-26619, a cross-site scripting vulnerability rated CVSS 5.3.. A patch is available.

Is there a public PoC exploit available for CVE-2025-26619?

Yes, a public proof-of-concept exploit is available for CVE-2025-26619. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-26619?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Vega Functions CVE-2025-26619

Q: What is the CVSS score of CVE-2025-26619?

CVE-2025-26619 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-03-27 security-advisories@github.com

XSS Vega Functions Vega

5.3

CVSS 4.0 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:33 vuln.today

Patch released

Mar 28, 2026 - 18:33 nvd

Patch available

PoC Detected

Apr 11, 2025 - 16:12 vuln.today

Public exploit code

CVE Published

Mar 27, 2025 - 14:15 nvd

MEDIUM 5.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

5 npm packages depend on vega (4 direct, 1 indirect)
6 npm packages depend on vega-functions (1 direct, 5 indirect)

Ecosystem-wide dependent count for version 5.31.0 and other introduced versions.

DescriptionGitHub Advisory

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.

AnalysisAI

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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 include: Vega-Functions Project Vega-Functions, Vega Project Vega.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-26619 vulnerability details – vuln.today

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