CVE-2026-126991

Description

The Wikidata Lookup expansion module (wiki.py) in MISP misp-modules contained a SPARQL injection vulnerability. The handler function constructed a SPARQL query by directly concatenating the user-supplied text value into the query string without any escaping or parameterization: 'SELECT ?item WHERE { ?item rdfs:label"' + request.get("text") + '" @en }'. An authenticated MISP user with access to the module could supply a crafted text attribute value containing SPARQL syntax (quotes, closing braces, UNION, SERVICE, LIMIT, etc.) to alter the structure of the query sent to the Wikidata SPARQL endpoint. This could allow an attacker to modify the query logic, extract unintended data, or cause the query to fail in ways that expose internal error details. Additionally, the old error handling path formatted raw exception objects into the response string ('wikidata API not accessible {}'.format(e)), potentially leaking internal information such as proxy credentials, query contents, or response bodies. The module also used a spoofed browser user-agent string and the deprecated Wikidata endpoint. The vulnerability required authenticated access to the MISP instance and the ability to invoke the wiki expansion module with a text attribute. The impact is limited to manipulation of the enrichment query and potential disclosure of internal error details; it does not directly compromise the MISP server or its stored data.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 5.3CVSS 4.0, Mediumfrom the CNA (CIRCL)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

What to do

• The vulnerability is remediated by properly escaping user-supplied text as a SPARQL string literal using json.dumps with ensure_ascii=False, which neutralizes quotes, backslashes, newlines, and control characters. Additional hardening includes strict validation of the language tag, numeric configuration values, text length, and UUID format before query construction; validation of Wikidata response structure and entity URI format before importing results; replacement of raw exception formatting with generic error messages that do not expose upstream details; use of the modern Wikidata SPARQL endpoint with POST method; a proper MISP user-agent string; and a bounded request timeout.CNA solution statement

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-143 SQL Injection (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 12 Nov 2026 Published

Weakness

• CWE-94
• CWE-209

References

• Security patchpatch
• misp.github.io
• github.com
• github.com