Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck
CVE-2026-82280Quivr Prompt Endpoints Missing Ownership Validation
High 7.1
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 29% of all known vulnerabilities).
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.4%top 71.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Quivr through 0.0.322 fails to validate ownership in prompt endpoints, allowing authenticated users to modify any prompt by identifier. Attackers with read-only access to shared brains can read exposed prompt identifiers and overwrite system prompts affecting all brain users.
Affected products (as reported)
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
References
- GitHub Issue #3698 issue-tracking
- https://github.com/QuivrHQ/quivr product
- Vulnerable code: prompt_routes.py technical-description
- VulnCheck Advisory: Quivr Prompt Endpoints Missing Ownership Validation third-party-advisory
- https://github.com/The-Vibe-Company/Quivr/issues/3698 exploit