CVE-2026-126991

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. Limited direct impact.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-11-12 07:30 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-11-12 08:16 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-11-12 08:16 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: not scored yet.
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-11-12 08:16 UTC

Last modified

2026-11-12 08:16 UTC

Weakness

CWE-94 · Code injection

Record status

Deferred

Attack profile CVSS 4.0 · 5.3

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

None

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-126991.md and follow it. Check whether this project is affected by CVE-2026-126991. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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