CVE-2026-1337
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
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.
Risk Assessment
Risk of XSS attack on a user who opens logs in a browser or tool that interprets HTML, potentially leading to execution of malicious script.
Recommendation
Update Neo4j to version 2026.01 or later. If not possible, treat logs as plain text and avoid opening them in tools that interpret HTML.
Other vulnerabilities in Neo4j
See all- CVE-2026-14587High
A vulnerability in Neo4j's Bolt modern handshake decoder treats an overlong capability bit mask the same as a truncated one. An unauthenticated client can send a selected protocol version with 32 continuation bytes, causing the decoder to reset the reader index and wait for more bytes instead of rejecting the message. The channel remains open, which can be exploited before authentication.
- CVE-2024-34517Medium
The Cypher component in Neo4j 5.0.0 through 5.18 mishandles IMMUTABLE privileges in some situations where an attacker already has admin access.
Original NVD description (English source)
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