CVE-2026-17556

CVE-2026-17556 is a path traversal vulnerability in GitHub Enterprise Server (all versions prior to 3.22). The X-GitHub-Request-Id request header was used without sanitization as a filesystem path segment for the upload buffer directory. An unauthenticated attacker with only network reachability ...

CVE-2026-9312

CVE-2026-9312 – GitHub Enterprise Server SSRF : An unauthenticated attacker could exploit insufficient input validation in an upload endpoint to inject path traversal and redirect internal API calls, potentially accessing internal services and sensitive credentials. Affected: all GitHub Enterpris...

CVE-2026-3854

CVE-2026-3854 describes an RCE vulnerability in GitHub Enterprise Server arising during git push option handling. An attacker with push access could abuse unsanitized user-supplied push option values that are incorporated into internal service headers; because the header format uses a delimiter t...

CVE-2026-4296

CVE-2026-4296 concerns an incorrect regular expression vulnerability in GitHub Enterprise Server that bypasses the OAuth redirect URI validation. An attacker who knows a first-party OAuth app’s registered callback URL could craft a malicious authorization link that, when clicked by a victim, redi...

CVE-2026-8606

A Server-Side Request Forgery (SSRF) in GitHub Enterprise Server was exposed via the security advisories package lookup endpoint, allowing an attacker to issue HTTP requests to internal services. By directing requests to an internal management service and measuring response timing, an attacker co...

CVE-2026-15996

The CVE describes a denial-of-service flaw in GitHub Enterprise Server where unauthenticated attackers could trigger excessive CPU usage and exhaust request-handling worker processes by sending a crafted form-encoded HTTP POST containing deeply nested parameters. Because parameter parsing occurre...

CVE-2026-10585

CVE-2026-10585 describes a stored XSS in GitHub Enterprise Server where an authenticated attacker could execute JavaScript in another user’s browser by injecting a crafted payload into a Discussion title in the Q&A category. The vulnerability stems from the AnsweredQuestionStructuredDataComponent...

CVE-2026-9132

CVE-2026-9132 describes a missing authorization flaw in GitHub Enterprise Server where an authenticated user could read source code from private repositories via the Copilot pull request description diff summary endpoint. The vulnerability allowed a user with read access to at least one repositor...

CVE-2026-8034

CVE-2026-8034 is a server-side request forgery (SSRF) vulnerability in the GitHub Enterprise Server notebook viewer. The issue stems from URL parser confusion between the validation layer and the HTTP request library, where hostname validation uses a different parser than the request library, all...

CVE-2026-1355

GitHub Enterprise Server contains a Missing Authorization vulnerability in the repository migration upload endpoint. An authenticated attacker could supply a migration identifier to overwrite or replace a victim’s migration archive, potentially causing victims to download attacker-controlled repo...

CVE-2026-18730

This is a server-side request forgery (SSRF) vulnerability in GitHub Enterprise Server affecting the Manage API . An unauthenticated endpoint parsed an attacker-supplied cluster configuration and issued gateway-to-agent requests whose HMAC authenticated only a timestamp , not the request path or ...

CVE-2026-19118

A time-of-check time-of-use (TOCTOU) race condition in GitHub Enterprise Server enabled remote code execution . Exploitation required an authenticated user with write access to a repository and precise timing of concurrent upload requests . All versions prior to 3.22 were affected; fixes are avai...

CVE-2026-3306

CVE-2026-3306 describes an improper authorization in GitHub Enterprise Server where a user with read access to a repository and write access to a project could modify issue and pull request metadata via the project without repository write permissions being verified during column value updates. T...

CVE-2026-0573

CVE-2026-0573 affects GitHub Enterprise Server. The repository_pages API insecurely follows HTTP redirects when fetching artifact URLs, preserving the Authorization header containing a privileged JWT. An authenticated user could redirect requests to an attacker-controlled domain, exfiltrate the A...

CVE-2026-6736

CVE-2026-6736 describes an authentication bypass in GitHub Enterprise Server (GHES) : when external authentication is enabled, the signup endpoint could create a local user account and establish a session without validating the external identity provider. This unauthenticated access required netw...

CVE-2026-76851

A Server-Side Request Forgery (SSRF) vulnerability in GitHub Enterprise Server allowed remote code execution on the instance. The root cause was insufficient network isolation that permitted malicious pre-receive hook code to impersonate an internal service and redirect trusted internal requests ...

CVE-2026-8106

CVE-2026-8106 describes a reflected HTML injection in the GitHub Enterprise Server Management Console login page. The vulnerability lies in the redirect_to query parameter on the /setup/unlock endpoint, which is reflected into an HTML attribute without proper sanitization. An attacker could entic...

CVE-2026-3307

GitHub Enterprise Server vulnerability CVE-2026-3307 allows an admin on one repository to modify the secret scanning push protection delegated bypass reviewers for another repository by changing the owner_id in the request body. Authorization is checked against the URL repository, but the action ...

CVE-2026-14340

GitHub Enterprise Server (GitHub ES) suffers an incorrect authorization vulnerability (CVE-2026-14340) where a user-to-server token scoped to a GitHub App installation could perform write operations on public repositories outside the token’s scope. The root cause is an authorization check that on...

CVE-2026-5845

Summary: CVE-2026-5845 affects GitHub Enterprise Server versions prior to 3.21, due to an improper authorization fallback in scoped user-to-server (ghu_) token handling. An authenticated attacker could access private repositories outside the intended installation scope, potentially including writ...

CVE-2026-3582

CVE-2026-3582 affects GitHub Enterprise Server. An Incorrect Authorization vulnerability allowed an authenticated user with a classic PAT lacking the repo scope to retrieve issues and commits from private/internal repositories via the search REST API, provided the user already had access to the r...

CVE-2026-9106

The CVE-2026-9106 issue concerns GitHub Enterprise Server where a UI misrepresentation allowed an OAuth app to gain unauthorized access to an organization’s runner management. A victim could be tricked into authorizing an app requesting the manage_runners:org scope because the scope was not shown...

CVE-2026-7541

CVE-2026-7541 is a denial-of-service vulnerability in GitHub Enterprise Server. An unauthenticated attacker could trigger service disruption by sending crafted requests with deeply nested JSON payloads to an unauthenticated API endpoint. The endpoint parsed user-controlled JSON bodies without siz...

CVE-2026-1999

CVE-2026-1999 affects GitHub Enterprise Server and is an incorrect authorization vulnerability in the enable_auto_merge mutation for pull requests. An attacker could merge their own PR into a repository without push access under specific conditions: the repository must allow forking, a clean PR s...

CVE-2026-5512

CVE-2026-5512 describes an improper authorization vulnerability in GitHub Enterprise Server where an authenticated attacker could determine private repository names by numeric ID via the mobile upload policy API endpoint. The issue arises from a failure to perform an early authorization check and...

CVE-2026-5921

CVE-2026-5921 describes a server-side request forgery (SSRF) in GitHub Enterprise Server. The notebook rendering service can be reached via an open redirect chain when private mode is disabled, allowing an unauthenticated SSRF to internal services. A timing side-channel across a regex-filtered in...

CVE-2025-13744

CVE-2025-13744 affects GitHub Enterprise Server. The issue is an Improper Neutralization of Input During Web Page Generation in the Filter (search) component, allowing attacker-controlled HTML to be rendered across GitHub and potentially exfiltrate sensitive information. An attacker must have per...

CVE-2026-2266

CVE-2026-2266 : In GitHub Enterprise Server, there is a DOM-based cross-site scripting vulnerability caused by improper neutralization of input in the task list content rendering. Authenticated users can craft malicious task list items in issues or pull requests to inject user-supplied HTML and e...