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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.

PUBLISHED Reserved 2026-01-08 | Published 2026-04-03 | Updated 2026-04-06 | Assigner VulnCheck




HIGH: 8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-178 Improper Handling of Case Sensitivity

Product status

Default status
unaffected

Any version before 1464475df2698fb7ccd0cdbc382b0750466f891d
affected

Credits

Mehmet Ince @mdisec finder

References

github.com/f/prompts.chat/pull/1098 issue-tracking

github.com/...ommit/1464475df2698fb7ccd0cdbc382b0750466f891d patch

www.vulncheck.com/...on-via-case-sensitive-username-handling third-party-advisory

cve.org (CVE-2026-22665)

nvd.nist.gov (CVE-2026-22665)

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