CVE-2026-123291: JetBrains Datalore · Insecure Direct Object Reference
Affects JetBrains DataloreSource CVE Database V5
Not known to be exploited · CVSS 4.3 Medium : upgrade to 2026.4 when convenient.
Data as of 6 Nov 2026, 11:03 UTC
Thin evidence
One scorer or none| CNA (JetBrains) | CVSS 3.1 | 4.3 |
|---|
- Patch
- Available – fixed in 2026.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 6 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade JetBrains Datalore to 2026.4.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| JetBrainsDatalore | Affected
| Fixed in
|
AI-suggested
Upgrade JetBrains Datalore to version 2026.4 or later, where this authorization bypass vulnerability is fixed.
Description
CVE-2026-123291 is an authorization bypass vulnerability in JetBrains Datalore versions before 2026.4. The flaw involves improper owner validation that allows an attacker with limited privileges to read issues and runs from another user's workspace. This vulnerability has a CVSS score of 4.3, indicating a medium severity level. The issue is fixed in version 2026.4.