What’s Vulnerable › Vulnerabilities

CVE-2026-22665: prompts.chat Identity Confusion via Case-Sensitive Username Handling

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-03 · updated 2026-07-24
• Weakness: CWE-178

Description

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.

Affected products

• Fka Prompts.Chat: before 2026-03-24 — fixed in 2026-03-24

How to fix

Upgrade to a fixed version: Fka Prompts.Chat 2026-03-24. Check the vendor advisory for mitigations.

References

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

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