CVE-2026-22665

prompts.chat prior to commit 1464475 contains an identity confusion vulnerability due to inconsistent case-sensitive and case-insensitive handling of usernames across write and read paths, allowing attackers to create case-variant usernames that bypass uniqueness checks. Attackers can exploit non-deterministic username resolution to impersonate victim accounts, replace profile content on canonical URLs, and inject attacker-controlled metadata and content across the platform.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/f/prompts.chat/commit/1464475df2698fb7ccd0cdbc382b0750466f891d	Patch
https://github.com/f/prompts.chat/pull/1098	Exploit Issue Tracking Vendor Advisory
https://www.vulncheck.com/advisories/prompts-chat-identity-confusion-via-case-sensitive-username-handling	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:fka:prompts.chat:*:*:*:*:*:*:*:*

History

13 Apr 2026, 18:10

Type	Values Removed	Values Added
References	~~() https://github.com/f/prompts.chat/commit/1464475df2698fb7ccd0cdbc382b0750466f891d -~~	() https://github.com/f/prompts.chat/commit/1464475df2698fb7ccd0cdbc382b0750466f891d - Patch
References	~~() https://github.com/f/prompts.chat/pull/1098 -~~	() https://github.com/f/prompts.chat/pull/1098 - Exploit, Issue Tracking, Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/prompts-chat-identity-confusion-via-case-sensitive-username-handling -~~	() https://www.vulncheck.com/advisories/prompts-chat-identity-confusion-via-case-sensitive-username-handling - Third Party Advisory
CPE		cpe:2.3:a:fka:prompts.chat::::::::
First Time		Fka Fka prompts.chat

03 Apr 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-03 21:17

Updated : 2026-04-13 18:10

NVD link : CVE-2026-22665

Mitre link : CVE-2026-22665

CVE.ORG link : CVE-2026-22665

JSON object : View

Products Affected

fka

prompts.chat

CWE

CWE-178

Improper Handling of Case Sensitivity

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