intelligence_src_d11443da85ea659d49
- Source-provided label
- Publisher RSS metadata
- Evidence class
- mentioned in report
- Confidence
- Not reported
- Observed
- Feb 15, 2022 00:00 UTC
- Retrieved
- Oct 15, 2026 16:51 UTC
Cognito User Group spoofing
Opsmorph discovered an improper access control vulnerability in authorization logic common in applications built on AWS. The vulnerability means a user with permission to create a new Cognito User Group could fool authorization checks into thinking that the user is in any other existing Cognito User Group in the same User Pool, referred to as user group spoofing. When API Gateway is secured with a Cognito User Pool Authorizer it concatenates group names from the identity token into a comma separated string, and as Cognito also permits commas in the group names, this was an ambiguous representation of the groups a user was in that provided an opportunity for injection type attack. AWS have since fixed the Cognito User Pool Authorizer so that it now escapes special characters when parsing the groups claim of the token.
Reference details
- Source category
- research-report
- First reported
- Feb 15, 2022 00:00 UTC
- Last reported
- Feb 15, 2022 00:00 UTC
- Catalog updated
- Oct 15, 2026 16:51 UTC
- Record ID
8931c31d754aba611d349c5e16f1cf9012fa54a9da0487f4d1dc8e0a9e83ebe0
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