CVE-2026-31381
Received
Received - Intake
OAuth State Parameter Exposure Leaks Base64-Encoded User Emails
Publication date: 2026-03-20
Last updated on: 2026-04-16
Assigner: Rapid7, Inc.
Description
Description
An attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the OAuth callback URL.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| gainsight | assist | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-598 | The web application uses the HTTP GET method to process a request and includes sensitive information in the query string of that request. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability allows an attacker to extract user email addresses, which are considered personally identifiable information (PII), that are exposed in base64 encoding within the state parameter of the OAuth callback URL.
How can this vulnerability impact me? :
The impact of this vulnerability is the unauthorized disclosure of user email addresses. Since these email addresses are exposed in a way that can be extracted by an attacker, it can lead to privacy violations and potential misuse of this personal information.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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