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
An attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the OAuth callback URL.
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Meta Information
Published
2026-03-20
Last Modified
2026-04-16
Generated
2026-06-16
AI Q&A
2026-03-20
EPSS Evaluated
2026-06-15
NVD
CVE-2026-31381
EUVD
EUVD-2026-13684
Affected Vendors & Products
Showing 1 associated CPE
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Exploitability
CWE
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

Compliance Impact

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