CVE-2026-22665

HIGH 8.1

prompts.chat Identity Confusion via Case-Sensitive Username Handling

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

8th

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.

CWE	CWE-178
Vendor	f
Product	prompts.chat
Published	Apr 3, 2026
Last Updated	Apr 6, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

f / prompts.chat

0 < 1464475df2698fb7ccd0cdbc382b0750466f891d

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/f/prompts.chat/pull/1098 github.com: https://github.com/f/prompts.chat/commit/1464475df2698fb7ccd0cdbc382b0750466f891d vulncheck.com: https://www.vulncheck.com/advisories/prompts-chat-identity-confusion-via-case-sensitive-username-handling

Credits

Mehmet Ince @mdisec