Cross-site (XSS) vulnerability with Express API in Eta
Priority MEDIUM 44CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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 it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00614 49th percentileScored 2026-11-07
Fix Fixed eta (eta-dev): 2.0.0eta (npm): 2.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| eta-dev | eta | before 2.0.0 | 2.0.0 | Patch available | CNA |
| — | eta (npm) | before 2.0.0 | 2.0.0 | Patch available | GHSA-xrh7-m5pp-39r6 |
- eta Vendoreta-dev Affected before 2.0.0 Fixed in 2.0.0 Patch available CNA
- eta (npm) Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available GHSA-xrh7-m5pp-39r6
Remediation
- Fix · CNA eta (eta-dev) Fixed in 2.0.0
- Fix · GHSA-xrh7-m5pp-39r6 eta (npm) Fixed in 2.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-23630
- 2026-10-03 Alias added: GHSA-xrh7-m5pp-39r6
References
More Eta.js Eta vulnerabilities
- TI-2022-09490 Code injection in eta CVSS 3.1HIGH 8.8
Sources
- CVE-2023-23630 · CVE Program
- CVE-2023-23630 · NVD
- FIRST EPSS
- GHSA-xrh7-m5pp-39r6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences