Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck

CVE-2026-82284Quivr Chat Endpoints Missing Ownership Validation

High 8.1

In plain English

A high-severity authorization bypass via user-controlled key in quivr from QuivrHQ. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.4%top 62.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Quivr versions through 0.0.322 fail to validate chat ownership in the GET /chat/{chat_id}/history, DELETE /chat/{chat_id}, and POST /chat/{chat_id}/question/answer endpoints. Authenticated attackers can read other users' conversation histories including private knowledge base content, delete arbitrary chats, and inject fabricated messages into other users' conversations.

Affected products (as reported)

Vendor	Product	Versions
QuivrHQ	quivr	0 – through 0.0.322

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

GitHub Issue #3697 issue-tracking
https://github.com/QuivrHQ/quivr product
Vulnerable code: chat_routes.py technical-description
VulnCheck Advisory: Quivr Chat Endpoints Missing Ownership Validation third-party-advisory