Vulnerability in F Prompts.chat
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- F Prompts.chat — versions 0
- Fka Prompts.chat
Weakness classification (CWE)
References
- github.com/f/prompts.chat/pull/1098 (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- github.com/f/prompts.chat/commit/1464475df2698fb7ccd0cdbc382b0750466f891d (Patch, patch)
- www.vulncheck.com/advisories/prompts-chat-identity-confusion-via-case-sensitive… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-22665?
- CVE-2026-22665 is a high-severity vulnerability in F Prompts.chat, classified under Improper Handling of Case Sensitivity. CVSS score: 8.1/10. Published 2026-04-03.
- How severe is CVE-2026-22665?
- High severity. CVSS v3 base score is 8.1 out of 10.