CVE-2023-23630

Cross-site (XSS) vulnerability with Express API in Eta

8.6 HighFix available

Eta is an embedded JS templating engine that works inside Node, Deno, and the browser. XSS attack - anyone using the Express API is impacted. The problem has been resolved. Users should upgrade to version 2.0.0. As a workaround, don't pass user supplied things directly to res.render.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: High

Exploit likelihood

0.61%Down 0.3 points since Feb 1, 2023

What each source reports

CVE List Score used 8.6

Cross-site (XSS) vulnerability with Express API in Eta

Record: CVE-2023-23630
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2023-0593 8.6

Record: EUVD-2023-0593
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-xrh7-m5pp-39r6 8.6

XSS Attack with Express API

Impact

XSS attack - anyone using the Express API is impacted

Patches

The problem has been resolved. Users should upgrade to version 2.0.0.

Workarounds

Don't pass user supplied data directly to res.renderFile.

References

Are there any links users can visit to find out more? See https://github.com/eta-dev/eta/releases/tag/v2.0.0

Record: GHSA-xrh7-m5pp-39r6
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness: CWE-79
Updated: 2026-11-02

NVD 8.6

Record: CVE-2023-23630
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 8.6

Cross-site (XSS) vulnerability with Express API in Eta

Record: CVE-2023-23630
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness: CWE-79
Updated: 2026-11-02

OSVGHSA-xrh7-m5pp-39r6 8.6

XSS Attack with Express API

Impact

XSS attack - anyone using the Express API is impacted

Patches

The problem has been resolved. Users should upgrade to version 2.0.0.

Workarounds

Don't pass user supplied data directly to res.renderFile.

References

Are there any links users can visit to find out more? See https://github.com/eta-dev/eta/releases/tag/v2.0.0

Record: GHSA-xrh7-m5pp-39r6
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`eta` npm	before 2.0.0	2.0.0

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-23630 is a high vulnerability (CVSS 8.6) in Eta-dev Eta, published January 31, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. Fixed in eta 2.0.0.