Security Vulnerabilities
An authentication bypass vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to create a local user account, bypassing the configured external identity provider. When external authentication was enabled, the signup endpoint did not properly enforce the authentication restriction, allowing account creation and session establishment without identity provider validation. The created account was limited to the default base permissions configured on the instance. Exploitation required network access to a GHES instance configured with an external authentication provider. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18.
CVSS Score
6.3
EPSS Score
0.002
Published
2026-05-07
A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause service disruption by sending crafted requests with deeply nested JSON payloads to an unauthenticated API endpoint. The endpoint parsed user-controlled JSON request bodies without size or depth limits, causing excessive CPU and memory consumption. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18. This vulnerability was reported via the GitHub Bug Bounty program.
CVSS Score
6.3
EPSS Score
0.001
Published
2026-05-07
Server-side request forgery (ssrf) in Azure Notification Service allows an authorized attacker to elevate privileges over a network.
CVSS Score
8.1
EPSS Score
0.001
Published
2026-05-07
Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose information over a network.
CVSS Score
10.0
EPSS Score
0.001
Published
2026-05-07
Improper access control in Azure Managed Instance for Apache Cassandra allows an authorized attacker to execute code over a network.
CVSS Score
9.9
EPSS Score
0.001
Published
2026-05-07
Improper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.
CVSS Score
7.5
EPSS Score
0.001
Published
2026-05-07
Improper authorization in Microsoft Teams allows an authorized attacker to disclose information over a network.
CVSS Score
9.6
EPSS Score
0.001
Published
2026-05-07
Improper access control in Azure Managed Instance for Apache Cassandra allows an authorized attacker to execute code over a network.
CVSS Score
9.0
EPSS Score
0.001
Published
2026-05-07
Externally controlled reference to a resource in another sphere in Microsoft Partner Center allows an unauthorized attacker to perform spoofing over a network.
CVSS Score
8.2
EPSS Score
0.002
Published
2026-05-07
Improper neutralization of special elements used in a command ('command injection') in Azure Cloud Shell allows an unauthorized attacker to perform spoofing over a network.
CVSS Score
9.6
EPSS Score
0.0
Published
2026-05-07