CVE-2026-123282

JetBrains Datalore critical critical vulnerability, CVSS 9.1.

In JetBrains Datalore before 2026.4 missing expiration validation of account tokens allowed a new authenticated session

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9.1CVSS base score: critical, the highest band

0.3%chance of exploitation in the next 30 days (EPSS), 20th percentile

6 Novfirst published, 2026

Not yeton CISA's exploited list, as of 14 November 2026

Vendor and product	JetBrains · Datalore
Type	critical vulnerability
Severity	Critical 9.1 CVSS base score
Affected versions	Datalore: before 2026.4
First published	6 November 2026
Weakness	CWE-672
Exploited	Not confirmed. Critical flaws in JetBrains products have been exploited before: JetBrains appears on CISA's exploited list.

What to do

Patch before it is exploited

Step 1

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.

Step 2

If you cannot patch now, restrict network access to the affected product.

Step 3

Check for signs of compromise since the date it was added to the list.

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Questions

CVE-2026-123282 in short

Is CVE-2026-123282 being exploited?

Not confirmed as of 14 November 2026: CISA has not added it to its Known Exploited Vulnerabilities catalogue. Critical flaws in JetBrains products are a frequent target, so patch before that changes; this page is updated daily.

How severe is CVE-2026-123282?

NVD rates it critical, with a CVSS base score of 9.1.

Which versions of JetBrains Datalore are affected by CVE-2026-123282?

According to the CVE record: Datalore: before 2026.4. Check the vendor's advisory for the fixed version.

How do I fix CVE-2026-123282?

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.

Sources: NVD, the CVE record, FIRST EPSS and the CISA Known Exploited Vulnerabilities catalogue. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 14 November 2026.