CVE-2026-123288: JetBrains Datalore · Cross-site Scripting
Affects JetBrains DataloreSource CVE Database V5
Not known to be exploited · CVSS 5.4 Medium : upgrade to 2026.4 when convenient.
Data as of 6 Nov 2026, 11:04 UTC
Thin evidence
One scorer or none| CNA (JetBrains) | CVSS 3.1 | 5.4 |
|---|
- Patch
- Available – fixed in 2026.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 stored XSS vulnerability has been fixed. No additional mitigation is required once the official fix is applied.
Description
CVE-2026-123288 is a medium severity stored cross-site scripting (XSS) vulnerability in JetBrains Datalore versions before 2026.4. The flaw allows stored XSS via the Vega editor link in notebook charts. This vulnerability was fixed in version 2026.4.