CVE-2023-23630: Eta is an embedded JS templating engine that works inside Node, Deno, and the browser

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HIGH 8.6REMOTEUPGRADE

CVE-2023-23630 is a high-severity flaw (CVSS 8.6) affecting eta. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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`.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-02-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: eta.js

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-01 01:15 UTCPublished CVE record published
2026-06-17 05:37 UTCUpdated Record last modified

eta.js eta UPGRADE

Affected: < 2.0.0

Fixed in: 2.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls eta

2. UPGRADE to 2.0.0

npm install eta@">=2.0.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-23630?

eta: upgrade to 2.0.0. Exact commands for each OS are on this page.

Is CVE-2023-23630 being exploited?

CVE-2023-23630 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-23630 affect?

CVE-2023-23630 affects eta. Severity is high (CVSS 8.6). 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

How urgent is CVE-2023-23630?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-25967 HIGH 8.1 UPGRADE Versions of the package eta before 2.0.0 are vulnerable to Remote Code Execution (RCE) by overwriting template

References

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