No exploitation reportedFix available

CVE-2020-26296

Q: Is CVE-2020-26296 actively exploited?

Active exploitation of CVE-2020-26296 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-26296?

CVE-2020-26296 has a CVSS v3 base score of 8.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

No exploitation reported by the sources we read.

Published2020-12-30
Fixed in5.17.3
WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. Vega in an npm package. In Vega before version 5.17.3 there is an XSS vulnerability in Vega expressions. Through a specially crafted Vega expression, an attacker could execute arbitrary javascript on a victim's machine. This is fixed in version 5.17.3

Timeline

dates in UTC

2020-12-3023:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-26296?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-26296?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Vega project vega

Branch	Affected	Fixed in	Source
5.17	< 5.17.3	5.17.3	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Vega project vega to 5.17.3

Advisories and patches

github.comRelease Notes

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.18.7read 2026-10-23
NVDCVSS 3.18.7read 2026-10-23
NVDCVSS 2.03.5read 2026-10-23
CNAweakness (CWE)CWE-79read 2026-10-23
FIRST EPSSEPSS score1.7 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Published: 2020-12-30
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-26296?

Is CVE-2020-26296 actively exploited?

Active exploitation of CVE-2020-26296 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-26296?

CVE-2020-26296 has a CVSS v3 base score of 8.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

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