Neo4j Enterprise and Community editions have insufficient escaping of unicode characters in query log

Description

Insufficient 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

Basic information

Type
reviewed
Severity
low
Advisory on GitHub
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Repository advisory
Source code
Browse source ↗
Published (advisory)
2026-02-06 15:31:03 UTC
Updated
2026-02-06 19:41:16 UTC
GitHub reviewed
2026-02-06 19:41:15 UTC
NVD published
2026-02-06

EPSS Score

Score Percentile
0.01% 1.80%

CVSS Scores

Base score Version Severity Vector
1.1 4.0
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 Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:P)
Additional preconditions must be present for exploitation.
Privileges required (PR:L)
Low privileges are required.
User interaction (UI:A)
User interaction is required in an active way.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:L)
Limited confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:L)
Limited integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:P)
Proof-of-concept: public PoC exists; no reported exploitation and no known simplification tools.

Identifiers

CWEs

CWE id Name
CWE-117 Improper Output Neutralization for Logs

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
maven org.neo4j:neo4j < 2026.01 2026.01

References

cvelogic Threat Intelligence