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

No history.

Information

Published : 2026-04-03 21:17

Updated : 2026-07-24 22:10

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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Los atacantes pueden explotar la resoluci\u00f3n no determinista de nombres de usuario para suplantar cuentas de v\u00edctimas, reemplazar el contenido del perfil en URL can\u00f3nicas e inyectar metadatos y contenido controlados por el atacante en toda la plataforma."}], "lastModified": "2026-07-24T22:10:00.140", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:fka:prompts.chat:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CC79D2B7-A39B-46F9-8909-B1B54FE7C05F", "versionEndExcluding": "2026-03-24"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}