SPARQL Injection in MISP Wikidata Lookup Module via Unescaped User Input (CVE-2026-126991)

What is affected, what to do

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 }'.

The available sources name no fixed version. Check the vendor guidance in the references below.

Affected

• Misp-modules lte *..3.1.4

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

Read in glossary

From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

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.

Source: ENISA EUVD, cvelistv5, NVD (NIST), CVE.org (MITRE)

Vendors and products

• MISP Misp-modules

Weakness classes (CWE)

• CWE-94Improper Control of Generation of Code ('Code Injection')

  Base

  The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

  Entry at MITRE CWE-94

• CWE-209Generation of Error Message Containing Sensitive Information

  Base

  The product generates an error message that includes sensitive information about its environment, users, or associated data.

  Entry at MITRE CWE-209

References & sources

• github.comSecurity patcheuvd, Patch
• misp.github.iomisp-modules/expansioneuvd
• github.comMISP/misp-modules/pull/869euvd
• github.comMISP/misp-moduleseuvd
• NVD (NIST)vuln/detail/CVE-2026-126991euvd

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 12.11.2026ReceivedCIRCL

   CVSS V4.0: AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

   CISA assessment (SSVC): exploitation: none known, automatable: yes

   Weakness type: CWE-94, CWE-209

   Description added or changed

   New references:

   • https://github.com/MISP/misp-modules
   • https://github.com/MISP/misp-modules/commit/7a2a7e3d9e0f67f6732bd8050ab7da79e7b344d9
   • https://github.com/MISP/misp-modules/pull/869
   • https://misp.github.io/misp-modules/expansion/#wikidata-lookup
   Show 10 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Description	added	—	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.
   CVSS	added	—	AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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
   Weakness type (CWE)	added	—	CWE-94
   Weakness type (CWE)	added	—	CWE-209
   Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/126xxx/CVE-2026-126991.json">CVE-2026-126991</a>
   Reference	added	—	https://github.com/MISP/misp-modules
   Reference	added	—	https://github.com/MISP/misp-modules/commit/7a2a7e3d9e0f67f6732bd8050ab7da79e7b344d9
   Reference	added	—	https://github.com/MISP/misp-modules/pull/869
   Reference	added	—	https://misp.github.io/misp-modules/expansion/#wikidata-lookup
   SSVC assessment	added	—	{"role":"Supplier","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-11-12T05:54:11Z"}

   Source identifier: 5a6e4751-2f3f-4070-9419-94fb35b644e8