Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects anomalous process execution chains originating from the Gitea server or Gitea act-runner processes following the exploitation of CVE-2026-20896. This vulnerability allows an attacker to bypass authentication using a forged X-WEBAUTH-USER header when REVERSE_PROXY_TRUSTED_PROXIES is insecurely configured. The rule identifies subsequent command-line activity such as spawning shells, using network utilities (wget, curl, netcat), or executing Gitea administrative commands by unauthorized child processes.
Detects unauthenticated HTTP requests to sensitive Gitea endpoints containing the 'X-WEBAUTH-USER' header set to 'admin'. This rule identifies exploitation attempts against misconfigured Docker deployments where 'REVERSE_PROXY_TRUSTED_PROXIES' is improperly set to a wildcard, allowing unauthorized users to impersonate administrative accounts (CVE-2026-20896).
Detects anomalous process execution chains originating from Gitea or Gitea Act Runner processes. This rule is designed to catch post-exploitation behavior associated with CVE-2026-20896, where an improperly configured reverse proxy allows an attacker to impersonate an administrator. The detection identifies shells, scripting interpreters, and network utilities spawned by the Gitea service, which may indicate command injection, malicious git hook execution, or CI/CD job abuse following an unauthorized administrative access.
Detects HTTP requests to Gitea instances containing the X-WEBAUTH-USER header, which facilitates user impersonation when Gitea is misconfigured with 'REVERSE_PROXY_TRUSTED_PROXIES = *' in a Docker environment. This vulnerability (CVE-2026-20896) allows an unauthenticated attacker to impersonate any user, including administrators.
This rule detects unauthorized exploitation attempts against Gitea environments vulnerable to CVE-2026-20896. When Gitea is configured with REVERSE_PROXY_TRUSTED_PROXIES set to permit all sources, an attacker can bypass authentication by injecting the 'X-WEBAUTH-USER: admin' header in HTTP requests. This allows the attacker to gain administrative privileges and perform unauthorized actions, such as creating new admin accounts or accessing restricted API endpoints.
Detects Gitea act_runner spawning Docker containers with dangerous runtime flags (e.g., --pid=host, --privileged, --cap-add=ALL) that facilitate host namespace escape. This activity is indicative of exploitation of CVE-2026-20896, where malicious CI/CD workflow YAML files inject these options to break out of the container sandbox and access the host filesystem.
Detects unauthorized HTTP requests to Gitea containing an 'X-WEBAUTH-USER' header set to 'admin'. This targets CVE-2026-20896, where a misconfigured reverse proxy trust setting allows external users to spoof authentication and gain administrative privileges.
Detects Gitea act_runner spawning Docker containers with dangerous runtime flags (e.g., --pid=host, --privileged, --cap-add=ALL) that facilitate host namespace escape. This activity is indicative of exploitation of CVE-2026-20896, where malicious CI/CD workflow YAML files inject these options to break out of the container sandbox and access the host filesystem.
This rule detects two distinct malicious activities related to Gitea installations: 1) Container escape attempts involving 'act-runner' processes configured with dangerous flags like --pid=host, --cap-add=ALL, or usage of nsenter, and 2) Potential administrative impersonation attempts against a Gitea instance via injection of the X-WEBAUTH-USER: admin HTTP header.
Detects exploitation attempts against Gitea instances where an attacker impersonates an admin user by injecting the 'X-WEBAUTH-USER' header. This vulnerability typically occurs when 'REVERSE_PROXY_TRUSTED_PROXIES' is misconfigured to trust all proxies ('*'), allowing unauthenticated users to gain administrative access via header manipulation. The rule covers web request headers, container logs for suspicious admin creation, and process execution arguments associated with the exploitation.
Detects the exploitation of CVE-2026-20896 in Gitea, where an unauthenticated attacker sends a crafted POST request to user registration or installation endpoints. The rule triggers when this network activity is followed by the creation of a new user account with administrative roles within a 10-minute window, indicating potential privilege escalation.