How severe is CVE-2023-23630?

CVE-2023-23630 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2023-23630 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-23630?

CVE-2023-23630 affects Eta.js Eta. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-23630?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-23630 published?

CVE-2023-23630 was published on 2023-02-01 and last updated on 2026-06-17.

CVE-2023-23630

CVE-2023-23630 is a high-severity vulnerability in Eta.js Eta with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Eta.js Eta
Published: 2023-02-01
Last modified: 2026-06-17

Description

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`.

Frequently asked questions

What is CVE-2023-23630?: 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`.
How severe is CVE-2023-23630?: CVE-2023-23630 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2023-23630 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-23630?: CVE-2023-23630 affects Eta.js Eta. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-23630?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-23630 published?: CVE-2023-23630 was published on 2023-02-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eta.js:eta:*:*:*:*:*:node.js:*:*

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