Improper Handling of Case Sensitivity Affecting prompts.chat package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PROMPTSCHAT-16080654
- published16 Apr 2026
- disclosed3 Apr 2026
- creditMehmet Ince
Introduced: 3 Apr 2026
NewCVE-2026-22665 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
prompts.chat is a Developer toolkit for AI prompts - build, validate, parse, and connect to prompts.chat
Affected versions of this package are vulnerable to Improper Handling of Case Sensitivity due to inconsistent case-sensitive and case-insensitive handling of usernames across write and read paths. An attacker can impersonate other users, replace profile content on canonical URLs, and inject attacker-controlled metadata and content across the platform by creating case-variant usernames that bypass uniqueness checks.