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CVE.org (no NVD analysis yet)· CNA JetBrains

CVE-2026-123286: In JetBrains Datalore before 2026.4 improper authorisation allowed read the notebook owner's file storage session token

MediumCVSS 6.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: JetBrains Datalore 2026.4.

Low priority for now. Upgrade to JetBrains Datalore 2026.4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Published
Nov 6, 2026
Updated
Nov 12, 2026
EPSS
0.1% · 7th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.5
CNA · JetBrains
5.9
0.6 point gap

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-123286

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
jetbrainsdatalore

Versions reported by the vendor

Affected version ranges reported by the assigning authority (JetBrains). Independent of NVD's CPE analysis and usually ahead of it.

  • JetBrains Datalore

    • before 2026.4affected · semver

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • jetbrains datalorebefore 2026.4

Same product

jetbrains: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-123279In JetBrains Datalore before 2026.4 code execution was possible in a notebook's computation by view-only collaborators
    36Monitor
  • CVE-2026-123836In JetBrains Datalore before 2026.4 workspace collaborators could obtain the owner's SSH private key via Git backup
    35Monitor
  • CVE-2026-123285In JetBrains Datalore before 2026.3 command execution was possible in the database task container via JVM options injection
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-123283Nov 6, 2026 · In JetBrains Datalore before 2026.4 account takeover was possible via SSO sign-in to a pre-registered account
    27Monitor
  • ← EarlierCVE-2026-123284Nov 6, 2026 · In JetBrains Datalore before 2026.4 improper authorisation on workspace moves allowed view-only collaborators to modify shared content
    26Monitor
  • Later →CVE-2026-123287Nov 6, 2026 · In JetBrains Datalore before 2026.4 private notebook files could be downloaded without authentication via published interactive reports
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
JetBrains Datalore2026.4Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+7 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1232790 days apartIn JetBrains Datalore before 2026.4 code execution was possible in a notebook's computation by view-only collaborators
    36Monitor
  • CVE-2026-1232800 days apartIn JetBrains Datalore before 2026.2.4 unauthenticated users could execute code via published interactive reports
    32Monitor
  • CVE-2026-1232870 days apartIn JetBrains Datalore before 2026.4 private notebook files could be downloaded without authentication via published interactive reports
    30Monitor
  • CVE-2026-1232840 days apartIn JetBrains Datalore before 2026.4 improper authorisation on workspace moves allowed view-only collaborators to modify shared content
    26Monitor
  • CVE-2026-1232890 days apartIn JetBrains Datalore before 2026.4 improper authorisation allowed notebook viewers to modify files
    17Monitor

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. CVSS5.9 → 6.5
  2. SSVC exploitation— → none
  3. Exploit maturity— → none
  4. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records