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Vulnerability record · CVE-2026-22665 · published 3 April 2026

CVE-2026-22665: Fka prompts.chat vulnerability

Fka · Prompts.Chat

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.

8.6 CVSS 4.0 High EPSS 0.33% · top 76.1% CWE-178 · CWE-178
8.6CVSS 4.0 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
24 Jul 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/f/prompts.chat/commit/1464475df2698fb7ccd0cdbc382b0750466f891d Patch
https://github.com/f/prompts.chat/pull/1098 ExploitIssue TrackingVendor Advisory
https://www.vulncheck.com/advisories/prompts-chat-identity-confusion-via-case-sensitive-username-handling Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2026-22663Fka prompts.chat missing authorization vulnerabilityprompts.chat prior to commit 7b81836 contains multiple authorization bypass vulnerabilities due to missing isPrivate checks across API endpoints and …EPSS 0.28%8.6CVE-2026-22661Fka prompts.chat path traversal vulnerabilityprompts.chat prior to commit 0f8d4c3 contains a path traversal vulnerability in skill file handling that allows attackers to write arbitrary files to…EPSS 0.36%7.1CVE-2026-22664Fka prompts.chat server-side request forgery (ssrf) vulnerabilityprompts.chat prior to commit 30a8f04 contains a server-side request forgery vulnerability in the Fal.ai media status polling feature that allows auth…EPSS 0.30%5.3CVE-2026-22662Fka prompts.chat server-side request forgery (ssrf) vulnerabilityprompts.chat prior to commit 1464475 contains a blind server-side request forgery vulnerability in the Wiro media generator that allows authenticated…EPSS 0.19%9.8CVE-2020-12812FortiOS SSL VPN two-factor authentication bypass via username case changeFortiOS SSL VPN fails to enforce the second authentication factor (FortiToken) when a user alters the letter case of their username. Because the user…KEVEPSS 49%analysed

Source: NIST National Vulnerability Database (record CVE-2026-22665), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.