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Fencer Vulns
medium 6.5

CVE-2023-26487 json

Vega has cross-site scripting vulnerability in `lassoAppend` function

published 2023-03-02 3 y ago modified 2026-09-10 1 mo ago also GHSA-w5m3-xh75-mp55 , EUVD-2023-1128

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm vega 5.23.0
  • npm vega-functions 5.13.1
  • vega-functions_project vega-functions 5.13.1
  • vega_project vega 5.23.0
  • vega.js Debian 14, Debian 13 5.25.0+ds+~cs5.3.0-1

debian advisories DEBIAN-CVE-2023-26487

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-26487 updated cvss 6.1

kibana: xss in custom visualizations

  • Red Hat JBoss Fuse 6 kibana kibana Red Hat JBoss Fuse Service Works 6 kibana kibana Red Hat OpenShift Container Platform 3.11 kibana, kibana kibana, openshift3/ose-logging-kibana5
    affected: no fix planned “Out of support scope”
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8, openshift-logging/cluster-logging-rhel8-operator
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/vega/vega/security/advisories/GHSA-w5m3-xh75-mp55 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm vega
<5.23.0
5.23.0
npm vega-functions
<5.13.1
5.13.1

Affected products

  • vega vega

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.