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  4. CVE 2026 104906 misp taxii object viewer stored xss via unescaped
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Back to active CVEs
Medium · CVSS 6.2CVE-2026-104906

MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output

Answer in brief

CVE-2026-104906 records a Medium severity (CVSS 6.2) vulnerability in MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output. The current sources do not mark it as known exploited. The current feed maps MISP/MISP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 2, 2026Updated Oct 2, 2026Source checked Oct 2, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.2
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MISP/MISP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
MISP/MISPgeneric>=0 <2.5.482.5.48

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for MISP/MISP.
  2. 2Review the reported fix. Source-reported solution: The fix applies HTML-encoding (via the h() helper) to the JSON string before it is interpolated into the HTML pre element. This ensures that any HTML or script markup present in the JSON string properties of a TAXII object is rendered as inert text rather than being parsed and executed by the browser, eliminating the XSS vector.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session. Preconditions: - The victim must be an authenticated MISP user with access to the TAXII object viewer. - The victim must open or view the crafted TAXII object. Impact: - Execution of arbitrary JavaScript in the victim's browser within the MISP application context. - Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface. - Potential for performing actions on behalf of the authenticated user. Affected versions: <2.5.48.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • MISP Stored XSS via Unescaped Count Field Value in Remote Event Preview IndexSame misp/misp package
  • MISP ID Translator: Unescaped Remote Event ID Enables Cross-Site Scripting via Linked ServerSame misp/misp package
  • MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline HandlerSame misp/misp package
  • MISP Decaying Model Import Mass Assignment Allows Cross-Organization Model Overwrite and Default FlaggingSame misp/misp package
  • MISP Information Disclosure via Related Events Listing Bypassing Per-Event AuthorizationSame misp/misp package
  • MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute DataSame misp/misp package

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 2, 2026
References
1 linked source
Open source record