# CVE-2026-4810: Agent Development Kit (ADK) - Authentication Bypass

> Live exploitation tracking for CVE-2026-4810 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-4810

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 9.3
- **Public exploit available:** Yes
- **Affected products:** Google Cloud Agent Development Kit (ADK)
- **Weaknesses:** CWE-306 (Missing Authentication for Critical Function)
- **Tags:** ai_mcp, python

## Description

A Code Injection and Missing Authentication vulnerability in Google Agent Development Kit (ADK) versions 1.7.0 (and 2.0.0a1) through 1.28.1 (and 2.0.0a2) on Python (OSS), Cloud Run, and GKE allows an unauthenticated remote attacker to execute arbitrary code on the server hosting the ADK instance.

This vulnerability was patched in versions 1.28.1 and 2.0.0a2.


Customers need to redeploy the upgraded ADK to their production environments. In addition, if they are running ADK Web locally, they also need to upgrade their local instance.

## CrowdSec analysis

[CVE-2026-4810](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-4810) is a critical vulnerability in Google Cloud's Agent Development Kit (ADK) that allows unauthenticated remote attackers to bypass authentication and inject arbitrary code on affected servers. Exploitation of this flaw could lead to full remote code execution, enabling attackers to compromise cloud environments running on Python, Cloud Run, or GKE. This vulnerability poses a significant risk of data theft, service disruption, or further lateral movement within compromised cloud infrastructures.

CrowdSec has been tracking this vulnerability and its exploits since 3rd of June 2026.

CrowdSec network observations suggest that most exploitation of CVE-2026-4810 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental.
CrowdSec network telemetry also shows that exploitation of CVE-2026-4810 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers exploit unauthenticated access to the `/builder/save` endpoint, uploading malicious Python files to achieve remote code execution on vulnerable Google ADK-Python servers.

## Timeline

- 2026-04-13: CVE Published. CVE-2026-4810 is published to NVD.
- 2026-06-03: Rule Released. CrowdSec releases a rule to detect CVE-2026-4810 exploitation attempts against the CrowdSec Network.
- 2026-06-04: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2026-4810 for the first time.

## References

- https://github.com/google/adk-python/blob/main/CHANGELOG.md#1274-2026-03-26
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-4810.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-4810) follows observed exploitation activity for CVE-2026-4810. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.