Listen to this Post
How CVE-2026-55863 Works
The vulnerability exists in the `ActionHandler.post()` method within the `motioneye/handlers/action.py` file. This handler is responsible for processing POST requests to endpoints like /action/<camera_id>/<action>, which are used to control camera functions such as taking snapshots, starting/stopping recordings, and executing predefined action scripts (e.g., PTZ controls, alarm triggers).
The core issue is the complete absence of an authentication decorator on this method. In the motionEye codebase, other sensitive handlers are correctly protected using the `@BaseHandler.auth()` or `@BaseHandler.auth(admin=True)` decorators to ensure that only authenticated users can access them. However, the `ActionHandler.post()` method lacks this protection, meaning it can be invoked by any unauthenticated attacker.
When a POST request is made to this endpoint, the method parses the `camera_id` and `action` parameters from the URL path. It then checks if the camera ID is valid. If the action is snapshot, it calls the `self.snapshot()` method, which triggers the camera to capture an image. For `record_start` or record_stop, it calls the corresponding methods to control video recording. For custom actions, it retrieves the associated shell command from the configuration and executes it using self.run_command_bg().
All of these operations are performed without any authentication check. An attacker can simply send a crafted POST request to the motionEye server (typically running on port 8765) and trigger any of these actions. The server will process the request and return a `200 OK` response, confirming the action was executed. This was dynamically confirmed on version v0.43.1 in a Docker lab environment.
DailyCVE Form
Platform: motionEye
Version: v0.43.1
Vulnerability: Missing Authorization
Severity: Medium (5.3)
date: 2026-06-23
Prediction: 2026-07-07
What Undercode Say
Analytics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: None
- Scope: Unchanged
- Confidentiality Impact: None
- Integrity Impact: Low
- Availability Impact: None
Bash Commands & Code:
Exploitation via cURL:
Trigger a snapshot on camera ID 1 curl -X POST http://motioneye-host:8765/action/1/snapshot Start recording on camera ID 2 curl -X POST http://motioneye-host:8765/action/2/record_start Trigger a custom action script (e.g., alarm_on) curl -X POST http://motioneye-host:8765/action/1/alarm_on
Vulnerable Code Snippet (motioneye/handlers/action.py):
class ActionHandler(BaseHandler): async def post(self, camera_id, action): ← NO @BaseHandler.auth() decorator camera_id = int(camera_id) if camera_id not in config.get_camera_ids(): raise HTTPError(404, 'no such camera') ... action execution without authentication
Correctly Protected Handler (for comparison):
@BaseHandler.auth(admin=True) ← properly protected async def delete(self, camera_id, filename): ... deletion logic
Exploit
An attacker can exploit this vulnerability by sending unauthenticated POST requests to the `/action/
1. Identify a reachable motionEye instance (typically on port 8765).
2. Determine a valid `camera_id` (often `1` or `2` for default configurations).
3. Choose an `action` to perform (e.g., snapshot, record_start, record_stop, or any custom action script name like alarm_on, light_off, etc.).
4. Send the POST request.
The server will process the request and execute the specified action, returning a `200 OK` response. The exploitation is trivial and requires no user interaction.
Protection
To protect against CVE-2026-55863, the following measures are recommended:
– Upgrade: The most effective fix is to upgrade motionEye to version 0.44.0 or later, which contains the official patch.
– Manual Patch: If upgrading is not immediately possible, manually add the authentication decorator to the `ActionHandler.post()` method in motioneye/handlers/action.py:
class ActionHandler(BaseHandler): @BaseHandler.auth() add this line async def post(self, camera_id, action): ... rest of the method
For stricter control, use `@BaseHandler.auth(admin=True)` to restrict access to admin users only.
– Network Segmentation: Restrict network access to the motionEye web interface (port 8765) to trusted networks only, preventing external unauthenticated access.
Impact
The impact of this vulnerability is significant despite its Medium severity rating:
– Unauthorized Surveillance: An attacker can trigger snapshots and start/stop video recordings at will, effectively bypassing any privacy or surveillance controls.
– Physical Security Bypass: If the administrator has configured action scripts for PTZ movement, alarm control, or lighting changes, an attacker can trigger these actions remotely. This could allow an attacker to disable alarms, move cameras to blind spots, or control physical access systems.
– Server-Side Request Forgery (SSRF): The vulnerability can be chained to perform SSRF attacks by triggering actions on remote motionEye servers configured in the system.
– Data Integrity: While the vulnerability does not allow data theft (Confidentiality Impact is None), it does allow an attacker to modify the state of the system (Integrity Impact is Low) by controlling recording and physical devices.
🎯Let’s Practice Exploiting & Learn Patching For Free:
🎓 Live Courses & Certifications:
Join Undercode Academy for Verified Certifications
🚀 Request a Custom Project:
Secure, high-velocity infrastructure and disruptive technological engineering. Contact our engineering team for high-tier development and proprietary systems:
[email protected]
💎 Smart Architecture | 🛡️ Secure by Design | ⭐ Trusted by Thousands
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
