Auth bypass in Quivrhq Quivr
CVE-2026-82280
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/QuivrHQ/quivr/issues/3698 (issue-tracking)
- github.com/QuivrHQ/quivr (product)
- github.com/QuivrHQ/quivr/blob/v0.0.322/backend/api/quivr_api/modules/prompt/con… (technical-description)
- www.vulncheck.com/advisories/quivr-prompt-endpoints-missing-ownership-validation (third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2026-82280?
- CVE-2026-82280 is a high-severity vulnerability in Quivrhq Quivr, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-08-28.
- How severe is CVE-2026-82280?
- High severity. CVSS v3 base score is 7.1 out of 10.