CVE-2022-0748Public exploitNetwork attack vector

Arbitrary code execution via JavaScript front matter

Published Mar 17, 2022 · Updated Sep 17, 2024

Code injection in EGOIST post-loader 0.0.0 and later allows attackers to execute arbitrary code through crafted Markdown files. The postLoader function passes the Markdown source to gray-matter, whose JavaScript front-matter mode evaluates content following a ---js delimiter instead of treating it as data. Execution occurs when a Webpack build processes an attacker-controlled Markdown file, granting the payload the build process's Node.js privileges.

CVSS severity9.8
Critical
EPSS probability2.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in EGOIST post-loader 0.0.0 and later allows attackers to execute arbitrary code through crafted Markdown files. The postLoader function passes the Markdown source to gray-matter, whose JavaScript front-matter mode evaluates content following a ---js delimiter instead of treating it as data. Execution occurs when a Webpack build processes an attacker-controlled Markdown file, granting the payload the build process's Node.js privileges.

The record

CVE
CVE-2022-0748
Published
Mar 17, 2022
Updated
Sep 17, 2024
Vendor
EGOIST
Product
post-loader
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EGOIST · post-loaderversion=0.0.0 <unspecified

Published CVSS scores

9.8SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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