CVE-2021-22868Network attack vector

Authenticated file disclosure via unrestricted Pages configuration

Published Sep 24, 2021 · Updated Aug 3, 2024

Path traversal in affected GitHub Enterprise Server releases allows remote authenticated users to read files during GitHub Pages builds. GitHub Pages accepts insufficiently restricted, user-controlled configuration options during a site build, allowing paths outside the intended build scope to be read. Affected releases are 2.22 before 2.22.22, 3.0 before 3.0.16, and 3.1 before 3.1.8; exploitation requires permission to create and build a Pages site.

CVSS severity4.3
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in affected GitHub Enterprise Server releases allows remote authenticated users to read files during GitHub Pages builds. GitHub Pages accepts insufficiently restricted, user-controlled configuration options during a site build, allowing paths outside the intended build scope to be read. Affected releases are 2.22 before 2.22.22, 3.0 before 3.0.16, and 3.1 before 3.1.8; exploitation requires permission to create and build a Pages site.

The record

CVE
CVE-2021-22868
Published
Sep 24, 2021
Updated
Aug 3, 2024
Vendor
Twitter
Product
GitHub Enterprise Server
Classifications
CWE-22, CWE-77, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.22 <2.22.22
  2. Affected versionversion=3.0 <3.0.16
  3. Affected versionversion=3.1 <3.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Twitter · GitHub Enterprise Serverversion=2.22 <2.22.22; version=3.0 <3.0.16; version=3.1 <3.1.8

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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