Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-82280

CVE-2026-82280HIGH

QuivrHQ quivr — Quivr Prompt Endpoints Missing Ownership Validation

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   N   L   H   N    7.1   .0025   14.9     —

AFFECTED
  Product  Versions     Fixed
  quivr    unspecified  —

TIMELINE
  Aug 28  Reserved by VulnCheck
  Aug 28  Published (CNA: VulnCheck)
  Aug 31  EXPLOIT PUBLISHED — CVE-2026-82280 (QuivrHQ quivr). Public exploit reference added.
  Sep 24  EXPLOIT PUBLISHED — CVE-2026-82280 (QuivrHQ quivr). Public exploit reference added.

CWE-639 · CNA: VulnCheck · CVSS v4.0 · 5 references · NVD status: Deferred

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 28, 2026	Reserved	Reserved by VulnCheck
August 28, 2026	Published	Published (CNA: VulnCheck)
August 31, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-82280 (QuivrHQ quivr). Public exploit reference added.
September 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-82280 (QuivrHQ quivr). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
QuivrHQ	quivr	—	—	—

Weaknesses

CWE-639

References (5)

https://github.com/QuivrHQ/quivr [product]
https://github.com/QuivrHQ/quivr/blob/v0.0.322/backend/api/quivr_api/modules/prompt/controller/prompt_routes.py [technical-description]
https://github.com/QuivrHQ/quivr/issues/3698 [issue-tracking]
https://github.com/The-Vibe-Company/Quivr/issues/3698 [exploit]
https://www.vulncheck.com/advisories/quivr-prompt-endpoints-missing-ownership-validation [third-party-advisory]

Authoritative record: CVE-2026-82280 at cve.org

Vendors: quivrhq

Weaknesses: CWE-639

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-82280 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.