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Fencer Intel
medium 5.4

CVE-2026-1337 json

Insufficient escaping of unicode characters in query log

published 9mo ago modified last mo. 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

Summary

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

  • 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

Is CVE-2026-1337 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
9mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Sources

Fencer Intel 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.