Insufficient escaping of unicode characters in query log

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-1337
StatePUBLISHED
AssignerNeo4j
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-06 14:16:38 UTC
Updated2026-08-28 16:08:28 UTC
DescriptionInsufficient escaping of unicode characters in query log in Neo4j Enterprise and Community editions prior to 2026.01 can lead to XSS if the user opens the logs in a tool that treats them as HTML. There is no security impact on Neo4j products, but this advisory is released as a precaution to treat the logs as plain text if using versions prior to 2026.01. Proof of concept exploit:  https://github.com/JoakimBulow/CVE-2026-1337

Risk And Classification

Primary CVSS: v4.0 1.1 LOW from 3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002230000 probability, percentile 0.127920000 (date 2026-08-30)

Problem Types: CWE-117 | CWE-117 CWE-117 Improper Output Neutralization for Logs

VersionSourceTypeScoreSeverityVector
4.03b236295-4ccd-4a1f-a1c1-a72eecc8d7b6Secondary1.1LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/C...
4.0CNACVSS1.1LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P
3.1[email protected]Primary5.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
Active
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Neo4j Neo4j All All All All
Application Neo4j Neo4j All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Neo4j Enterprise Edition affected 2026.01.0 date Not specified
CNA Neo4j Community Edition affected 2026.01.0 date Not specified

References

ReferenceSourceLinkTags
github.com/JoakimBulow/CVE-2026-1337 3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6 github.com Exploit, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Joakim Bülow (en)

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