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CVE-2026-1337

LowPublished

Insufficient escaping of unicode characters in query log

Published: Feb 6, 2026
Updated: Feb 6, 2026
Assigning CNA: Neo4j
Evidence observed: Aug 9, 2026

Primary CVSS

1.1/ 10Low

nvd · CVSS 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/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 probability estimate

0.2%

Low · next 30 days

Percentile: 14.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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

Sources

CVE-2026-1337-AI-Coding-Assistant-Prompt-Injection-to-Sandbox-EscapeExploit
A prompt injection in a code‑review bot that executes AI‑generated fixes in a sandbox. The sandbox uses a blacklist to prevent dangerous commands, but a polyglot payload bypasses the filter and achieves remote code execution.
CVE-2026-1337PoC
CVE-2026-1337 - Neo4j - Log Injection

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