Insufficient escaping of unicode characters in query log

published 2026-02-06 9 mo ago modified 2026-09-10 59 d ago also BIT-neo4j-2026-1337 , BIT-neo4j-enterprise-2026-1337 , EUVD-2026-5683 , GHSA-xr72-g735-4vwp

cvss: 5.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

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

Patch / fix

fixed in 5

maven org.neo4j:neo4j 2026.01
bitnami neo4j 2026.1.0
bitnami neo4j-enterprise 2026.1.0
neo4j Enterprise Edition 2026.01.0
neo4j Community Edition 2026.01.0

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-02-06)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/JoakimBulow/CVE-2026-1337 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	1.1	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
CNA	4.0	1.1	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
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
OSV	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
maven	org.neo4j:neo4j	<2026.01	2026.01
bitnami	neo4j	<2026.1.0	2026.1.0
bitnami	neo4j-enterprise	<2026.1.0	2026.1.0

Affected products

neo4j Enterprise Edition
neo4j Community Edition

Classification

Weakness

CWE-117 Improper Output Neutralization for Logs

References

github.com /JoakimBulow/CVE-2026-1337
exploit, web, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-1337
advisory, web
github.com /neo4j/neo4j
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary