High severity · published Aug 28, 2026
CVE-2026-82284
Quivr Chat Endpoints Missing Ownership Validation
8.1
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QU
quivr · QuivrHQ
through 0.0.322 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82284
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82284
github.com
https://github.com/QuivrHQ/quivr
github.com
https://github.com/QuivrHQ/quivr/blob/v0.0.322/backend/api/quivr_api/modules/chat/controller/chat_routes.py
github.com
https://github.com/QuivrHQ/quivr/issues/3697
www.vulncheck.com
https://www.vulncheck.com/advisories/quivr-chat-endpoints-missing-ownership-validation
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