GitHub Enterprise Server up to 3.20.0 API Endpoint insertion of sensitive information into sent data

Summaryinfo

A vulnerability was found in GitHub Enterprise Server up to 3.20.0. It has been classified as problematic. This impacts an unknown function of the component API Endpoint. This manipulation causes insertion of sensitive information into sent data. This vulnerability is handled as CVE-2026-5512. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in GitHub Enterprise Server up to 3.20.0. Affected by this vulnerability is an unknown code block of the component API Endpoint. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. The CWE definition for the vulnerability is CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

The weakness was released by ahacker1. The advisory is shared at docs.github.com. This vulnerability is known as CVE-2026-5512 since 04/03/2026. The exploitation appears to be easy. The attack can be launched remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Bug Tracking Software

Vendor

• GitHub

Name

• Enterprise Server

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.14.0
• 3.14.1
• 3.14.2
• 3.14.3
• 3.14.4
• 3.14.5
• 3.14.6
• 3.14.7
• 3.14.8
• 3.14.9
• 3.14.10
• 3.14.11
• 3.14.12
• 3.14.13
• 3.14.14
• 3.14.15
• 3.14.16
• 3.14.17
• 3.14.18
• 3.14.19
• 3.14.20
• 3.14.21
• 3.14.22
• 3.14.23
• 3.14.24
• 3.14.25
• 3.15
• 3.15.0
• 3.15.1
• 3.15.2
• 3.15.3
• 3.15.4
• 3.15.5
• 3.15.6
• 3.15.7
• 3.15.8
• 3.15.9
• 3.15.10
• 3.15.11
• 3.15.12
• 3.15.13
• 3.15.14
• 3.15.15
• 3.15.16
• 3.15.17
• 3.15.18
• 3.15.19
• 3.15.20
• 3.16
• 3.16.0
• 3.16.1
• 3.16.2
• 3.16.3
• 3.16.4
• 3.16.5
• 3.16.6
• 3.16.7
• 3.16.8
• 3.16.9
• 3.16.10
• 3.16.11
• 3.16.12
• 3.16.13
• 3.16.14
• 3.16.15
• 3.16.16
• 3.17
• 3.17.0
• 3.17.1
• 3.17.2
• 3.17.3
• 3.17.4
• 3.17.5
• 3.17.6
• 3.17.7
• 3.17.8
• 3.17.9
• 3.17.10
• 3.17.11
• 3.17.12
• 3.17.13
• 3.18
• 3.18.0
• 3.18.1
• 3.18.2
• 3.18.3
• 3.18.4
• 3.18.5
• 3.18.6
• 3.18.7
• 3.19
• 3.19.0
• 3.19.1
• 3.19.2
• 3.19.3
• 3.19.4
• 3.20.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

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Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

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