CVE-2023-29827: ejs v3.1.9 is vulnerable to server-side template injection

Q: How do I fix CVE-2023-29827?

ejs: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-29827 being exploited?

CVE-2023-29827 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-29827 affect?

CVE-2023-29827 affects ejs. Severity is critical (CVSS 9.8). 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 beca

Q: How urgent is CVE-2023-29827?

Priority 68/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-29827 is a critical-severity flaw (CVSS 9.8) affecting ejs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.6% (top 7%)
CISA exploited list	No
Weakness	CWE-74
Published	2023-05-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ejs

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

Am I affected?

Timeline

2023-05-04 14:15 UTCPublished CVE record published
2026-06-17 05:50 UTCUpdated Record last modified

ejs ejs DOWNGRADE

Affected: >= 3.1.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.9

1. Check installed version

npm ls ejs

2. No fixed release: DOWNGRADE to a release before 3.1.9

npm view ejs versions npm install ejs@"<3.1.9"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Embedded JavaScript(EJS) 3.1.6 - Template Injection

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-2023-29827?

ejs: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-29827 being exploited?

CVE-2023-29827 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-2023-29827 affect?

CVE-2023-29827 affects ejs. Severity is critical (CVSS 9.8). 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 beca

How urgent is CVE-2023-29827?

Priority 68/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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