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

CVE-2026-123858: In JetBrains PhpStorm before 2026.3 project files could be automatically uploaded to a deployment server from untrusted projects

MediumCVSS 4.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 17/100)

  • 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: 0.14% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: JetBrains PhpStorm 2026.3.

Low priority for now. Upgrade to JetBrains PhpStorm 2026.3 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 6, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.4 / 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
—
CNA · JetBrains
4.4
NVD has not scored this yet; the score shown is the CNA’s.

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-2026-123858

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.

—

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 PhpStorm

    • before 2026.3affected · semver

Same product

jetbrains: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-64809In JetBrains PhpStorm before 2026.2 arbitrary code execution was possible before granting project trust via the configured interpreter
    33Monitor
  • CVE-2026-64808In JetBrains PhpStorm before 2026.2 arbitrary code execution was possible before granting project trust via project tooling
    33Monitor
  • CVE-2021-25764In JetBrains PhpStorm before 2020.3, source code could be added to debug logs.
    21Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2022-48435Apr 4, 2023 · In JetBrains PhpStorm before 2023.1 source code could be logged in the local idea.log file
    13Monitor
  • ← EarlierCVE-2026-123857Nov 6, 2026 · In JetBrains PhpStorm before 2026.3 xXE was possible in untrusted projects via PHPMD ruleset autodetection
    17Monitor

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 PhpStorm2026.3Vendor (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-2026-64808106 days apartIn JetBrains PhpStorm before 2026.2 arbitrary code execution was possible before granting project trust via project tooling
    33Monitor
  • CVE-2026-64809106 days apartIn JetBrains PhpStorm before 2026.2 arbitrary code execution was possible before granting project trust via the configured interpreter
    33Monitor

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

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-829 · Inclusion of Functionality from Untrusted Control Sphere

CVSS vector

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

nvd-secondary

Attack context

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

References

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

All records