CVE-2022-39304

GitHub App JWT disclosure via refresh errors

Published Dec 20, 2022 · Updated Apr 16, 2025

Information disclosure in ghinstallation before 2.0.0 allows local users to obtain a GitHub App JWT through token-refresh errors. Transport.refreshToken formats the complete failed HTTP request into its non-2xx error, including the Authorization bearer token. Exposure requires a failed installation-token refresh and access to the propagated error; the JWT remains valid for no more than 10 minutes.

CVSS severity5.0
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in ghinstallation before 2.0.0 allows local users to obtain a GitHub App JWT through token-refresh errors. Transport.refreshToken formats the complete failed HTTP request into its non-2xx error, including the Authorization bearer token. Exposure requires a failed installation-token refresh and access to the propagated error; the JWT remains valid for no more than 10 minutes.

The record

CVE
CVE-2022-39304
Published
Dec 20, 2022
Updated
Apr 16, 2025
Vendor
Bradley Falzon
Product
ghinstallation
Classifications
CWE-209, T1528
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2025Record 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=< 2.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Bradley Falzon · ghinstallationversion=< 2.0.0

Published CVSS scores

5.0GitHubCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:L
4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
T1528Steal Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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