{"cve":"CVE-2023-23926","nvd":{"published":"2023-02-16T16:15:12.517","modified":"2026-06-17T05:38:18.227","status":"Modified","description":"APOC (Awesome Procedures on Cypher) is an add-on library for Neo4j. An XML External Entity (XXE) vulnerability found in the apoc.import.graphml procedure of APOC core plugin prior to version 5.5.0 and 4.4.0.14 (4.4 branch) in Neo4j graph database. XML External Entity (XXE) injection occurs when the XML parser allows external entities to be resolved. The XML parser used by the apoc.import.graphml procedure was not configured in a secure way and therefore allowed this. External entities can be used to read local files, send HTTP requests, and perform denial-of-service attacks on the application. Abusing the XXE vulnerability enabled assessors to read local files remotely. Although with the level of privileges assessors had this was limited to one-line files. With the ability to write to the database, any file could have been read. Additionally, assessors noted, with local testing, the server could be crashed by passing in improperly formatted XML. The minimum version containing a patch for this vulnerability is 5.5.0. Those who cannot upgrade the library can control the allowlist of the procedures that can be used in your system.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":8.1},"cwes":["CWE-611"],"references":["https://github.com/neo4j/apoc/pull/310","https://github.com/neo4j/apoc/releases/tag/5.5.0","https://github.com/neo4j/apoc/security/advisories/GHSA-6wxg-wh7f-rqpr","https://neo4j.com/docs/operations-manual/current/reference/configuration-settings/#config_dbms.security.procedures.allowlist","https://github.com/neo4j/apoc/pull/310"],"products":["neo4j:awesome_procedures_on_cyper"],"source":"nvd","synced_at":"2026-10-19T21:37:38.595364862+00:00"},"epss":{"cve":"CVE-2023-23926","score":0.00889,"percentile":0.5935,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6wxg-wh7f-rqpr","url":"https://osv.dev/vulnerability/GHSA-6wxg-wh7f-rqpr","summary":"XML External Entity (XXE) vulnerability in apoc.import.graphml","modified":"2026-09-10T03:49:56.724096522Z","packages":[{"ecosystem":"Maven","name":"org.neo4j.procedure:apoc-core","purl":"pkg:maven/org.neo4j.procedure/apoc-core","ranges":[">=5.0.0 <5.5.0"],"fixed":["5.5.0"]},{"ecosystem":"Maven","name":"org.neo4j.procedure:apoc-core","purl":"pkg:maven/org.neo4j.procedure/apoc-core","ranges":["<4.4.0.14"],"fixed":["4.4.0.14"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}