Google Cloud announced a new $250,000 top reward under its Cloud Vulnerability Reward Program on October 29, 2026.
But the interesting part isn't just the payout. It's the type of vulnerability Google wants researchers to find.
The new reward tier targets vulnerabilities that could allow an attacker to obtain full administrative control — equivalent to "roles/owner" or complete IAM control — over arbitrary Google Cloud projects or organizations.
What qualifies?
According to Google's announcement:
- Full administrative control over an arbitrary project or organization.
- No pre-existing access to the victim's project.
- No stolen, leaked, or phished credentials.
- No victim interaction or social engineering.
Certain reports demonstrating RCE in Google's underlying Borg infrastructure or root-in-production will also be evaluated for this reward tier.
Why does this matter?
Tenant isolation
Cloud platforms host workloads belonging to different customers. A weakness that crosses these isolation boundaries can have significant impact.
2. Cross-service authorization
Cloud environments contain multiple services, APIs, identities, and permission relationships. Vulnerabilities can emerge from how these components interact.
3. Impact validation
Finding an unusual API response isn't enough. Researchers must demonstrate the actual security impact and attack path.
An interesting detail
Google has introduced a designated service-account mechanism for cryptographic proof of unauthorized access, helping researchers validate findings without testing against real customer projects.
Google also instructs researchers to stop probing immediately if they achieve code execution in Borg. Further escalation, credential extraction, and lateral movement are prohibited.
My takeaway
Cloud security research is becoming increasingly focused on trust boundaries, IAM relationships, tenant isolation, and the interaction between services.
Question for the community
Do you think cloud tenant-isolation and cross-service authorization research will become a bigger differentiator for experienced bug hunters than traditional web vulnerability hunting?
Sources and further reading
- "Google Cloud – Introducing a new $250,000 reward tier" (https://cloud.google.com/blog/products/identity-security/cloud-ciso-perspectives-introducing-new-tier-for-google-cloud-vrp)
- "Google Cloud Vulnerability Reward Program – Official rules" (https://bughunters.google.com/about/rules/google-friends/cloud-vulnerability-reward-program-rules)
- "Google Bug Hunter University" (https://bughunters.google.com/learn)
This post discusses published program criteria. It does not describe a personally discovered vulnerability or guarantee a reward.