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Vulnerability record · CVE-2026-82281 · published 28 August 2026

CVE-2026-82281: Insecure direct object reference vulnerability

Kotaemon through 0.12.0 fails to properly validate conversation ownership in select_conv, delete_conv, rename_conv, and on_set_public_conversation functions in control.py. Attackers can read other users' chat histories, delete conversations, or rename conversations by supplying arbitrary conversation identifiers without proper authorization checks.

9.1 CVSS 4.0 Critical EPSS 0.33% · top 76.3% CWE-639 · Insecure direct object reference Deferred
9.1CVSS 4.0 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
23 Sep 2026Last modified by NVD

Description

Kotaemon through 0.12.0 fails to properly validate conversation ownership in select_conv, delete_conv, rename_conv, and on_set_public_conversation functions in control.py. Attackers can read other users' chat histories, delete conversations, or rename conversations by supplying arbitrary conversation identifiers without proper authorization checks.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/Cinnamon/kotaemon
https://github.com/Cinnamon/kotaemon/blob/9ad3e4e49aa35b8acddd235918a5d9753c1cfdf9/libs/ktem/ktem/pages/chat/control.py
https://github.com/Cinnamon/kotaemon/issues/846
https://www.vulncheck.com/advisories/kotaemon-missing-ownership-check-in-conversation-functions
https://github.com/Cinnamon/kotaemon/issues/846

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.4CVE-2026-55255Langflow IDOR in responses endpoint allows cross-user flow executionLangflow before 1.9.1 has an insecure direct object reference in the /api/v1/responses endpoint. An authenticated attacker can supply another user's …KEVEPSS 0.89%analysed

Source: NIST National Vulnerability Database (record CVE-2026-82281), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.