CVE-2026-82284: Quivr Chat Endpoints Missing Ownership Validation

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-09-23
Weakness: CWE-639

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

QuivrHQ quivr: through 0.0.322

References

https://github.com/QuivrHQ/quivr
https://github.com/QuivrHQ/quivr/blob/v0.0.322/backend/api/quivr_api/modules/chat/controller/chat_routes.py
https://github.com/QuivrHQ/quivr/issues/3697
https://www.vulncheck.com/advisories/quivr-chat-endpoints-missing-ownership-validation
https://github.com/QuivrHQ/quivr/issues/3697

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