Cross-user conversation disclosure via missing ownership checks
Published Aug 28, 2026 · Updated Aug 28, 2026
Authorization bypass in Cinnamon AI Kotaemon 0.12.0 and earlier allows remote attackers to read or alter other users' conversations. The select_conv query fetches messages by an arbitrary conversation identifier without rejecting nonowners, while delete_conv, rename_conv, and on_set_public_conversation modify records without verifying ownership. Unauthenticated reading requires a valid 128-bit conversation identifier; deletion or renaming requires a regular authenticated account.
Summary
What happened
Authorization bypass in Cinnamon AI Kotaemon 0.12.0 and earlier allows remote attackers to read or alter other users' conversations. The select_conv query fetches messages by an arbitrary conversation identifier without rejecting nonowners, while delete_conv, rename_conv, and on_set_public_conversation modify records without verifying ownership. Unauthenticated reading requires a valid 128-bit conversation identifier; deletion or renaming requires a regular authenticated account.
The record
- CVE
- CVE-2026-82281
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- Cinnamon AI
- Product
- Kotaemon
- Classifications
- T1485, T1213
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=0.12.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Cross-user conversation queue API proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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