Code injection in RazorEngine

published 2022-03-06 4 y ago modified 2026-06-17 4 mo ago also GHSA-ph3v-2hq5-5qfq , EUVD-2022-1498

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits: 0; none known

In the IsolatedRazorEngine component of Antaris RazorEngine through 4.5.1-alpha001, an attacker can execute arbitrary .NET code in a sandboxed environment (if users can externally control template contents). NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Patch / fix

fixed in 1

razorengine_project razorengine 4.5.1

Exploit prediction

1.86% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/Antaris/RazorEngine/issues/585 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
nuget	RazorEngine	<=4.5.1-alpha001	no fix listed

Classification

Weakness

CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine

References

github.com /Antaris/RazorEngine/issues/585
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-46703
advisory
github.com /Antaris/RazorEngine
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary