Microsoft Bug Bounty Rules Now Link Reward Size to Report Completeness
The MSRC has replaced tiered quality levels with a binary assessment, tying higher payouts to submissions that include all required reproduction details.
Key points
- Microsoft changed bug bounty assessment rules on 20 October 2026 to use only two categories: Complete and Not Complete.
- Rewards are now more directly linked to whether a submission includes full reproduction steps and technical analysis.
- Completeness does not determine severity; Microsoft still evaluates technical impact and scope independently for payment decisions.
Microsoft has updated its vulnerability disclosure process, introducing stricter documentation standards for its bug bounty programmes. The Microsoft Security Response Centre announced the changes on 20 October 2026. The new framework replaces previous multi-tiered quality assessments with a simple binary classification. Submissions are now judged as either Complete or Not Complete. This shift applies to all reports submitted after 8 AM Pacific Time on that date. Earlier submissions continue under the old rules.
Root cause
The previous system used multiple report quality levels, which Microsoft found led to frequent requests for missing information. The MSRC aims to reduce these back-and-forth interactions. By requiring all necessary evidence upfront, engineering teams can reproduce issues faster. This efficiency allows for quicker assessment of implications. The root of the change is a desire for clearer expectations. Researchers now know exactly what is needed for a submission to be considered thorough from the outset.
Attack path
The update does not change how vulnerabilities are exploited, but it changes how they must be described. Researchers must provide clear reproduction steps. A reliable and minimal proof of concept is mandatory. The submission must specify the vulnerability type. Detailed technical analysis identifying the root cause is required. Attackers’ positions, prerequisites, and conditions needed to trigger the flaw must be explained. Impact descriptions must clarify what an attacker could achieve.
Affected versions
The new rules apply to all Microsoft bug bounty programmes. They cover reports submitted on or after 20 October 2026. Earlier reports are grandfathered under the previous requirements. The changes affect how submissions are assessed for reward potential. Microsoft states that completeness is separate from the severity of the finding. A thorough report does not guarantee a high payout if the technical impact is low.
Mitigation
- Ensure all reproduction steps are clear and minimal.
- Include detailed technical analysis and root cause identification.
- Specify affected environments, platforms, and versions.
- Describe attacker prerequisites and potential impact clearly.
Why it matters
Security teams should understand that documentation quality now directly influences researcher compensation. This encourages thorough reporting, which can improve the speed of patch development. However, completeness is not a proxy for severity. Organisations receiving reports should still evaluate technical impact independently. Teams usually prioritise high-severity issues regardless of documentation depth. Check whether your vulnerability management processes account for incomplete but critical reports.
Background: Vulnerability disclosure policies
Implement a lightweight policy that defines safe testing boundaries and contact methods. This reduces legal risk and encourages responsible reporting. Focus on clear scope definition and a simple triage workflow rather than complex legal frameworks or expensive software tools.
Read the full guide: Vulnerability Disclosure Policies for Small Teams
What to do and how to stay safe: Microsoft
- Review internal triage processes to ensure severity assessment remains independent of report completeness.
- Encourage researchers to follow the new MSRC guidelines for maximum clarity.
- Monitor for updates on how these rules affect bounty payout timelines.
- Verify that all required artifacts are included before submitting external reports.
Step-by-step guide: Password Policies Examples That Reduce Password Fatigue
General security guidance from the Vector Bulletin newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Do complete reports automatically get paid?
No, Microsoft states that completeness does not guarantee payment; technical impact and scope are evaluated separately.
When did these rules start?
They apply to reports submitted on or after 20 October 2026 at 8 AM Pacific Time.
What makes a report complete?
It must include reproduction steps, a proof of concept, vulnerability type, root cause analysis, and impact description.
