CVE-2023-29827

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-05-04. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ejs v3.1.9 is vulnerable to server-side template injection. If the ejs file is controllable, template injection can be implemented through the configuration settings of the closeDelimiter parameter. NOTE: this is disputed by the vendor because the render function is not intended to be used with untrusted input.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
92.0%
KEV
Not listed

Published

May 4, 2023

Last Modified

December 3, 2025

Advisory Details (2)

Auto-updated Jun 30, 2026
No patch confirmed yet.
generic

EJS, Server side template injection ejs@3.1.9 Latest · Issue #720 · mde/ejs · GitHub

https://github.com/mde/ejs/issues/720
generic

ejs/SECURITY.md at main · mde/ejs · GitHub

https://github.com/mde/ejs/blob/main/SECURITY.md#out-of-scope-vulnerabilities

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2023/CVE-2023-29827.yaml
    First seen Jan 1, 2023

    Embedded JavaScript(EJS) 3.1.6 - Template Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-29827?
CVE-2023-29827 is a critical vulnerability published on May 4, 2023. ejs v3.1.9 is vulnerable to server-side template injection. If the ejs file is controllable, template injection can be implemented through the configuration settings of the closeDelimiter parameter. NOTE: this is disputed by the vendor because the render function is not intended to be used with…
When was CVE-2023-29827 disclosed?
CVE-2023-29827 was first published in the National Vulnerability Database on May 4, 2023, with the most recent update on December 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-29827 actively exploited?
CVE-2023-29827 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-29827?
CVE-2023-29827 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-29827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-29827, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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