EUVD-2026-18829
GHSA-pcq9-m482-5r7j
CVSS Vector
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:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
Identity confusion in prompts.chat (prior to commit 1464475) enables authenticated attackers to impersonate users and hijack profile URLs by creating case-variant usernames (e.g., 'Alice' vs 'alice'). Inconsistent case-handling between write and read operations allows bypass of uniqueness validation, letting attackers inject malicious content on canonical victim profiles. …
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Remediation
Within 24 hours: Identify all prompts.chat instances in your environment and document current deployed version. Within 7 days: Apply vendor patch (commit 1464475 or later) to all prompts.chat deployments and validate case-sensitive username uniqueness is enforced. …
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External POC / Exploit Code
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