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  4. CVE 2026 104907 misp javascript injection via remote tag id in
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Back to active CVEs
Medium · CVSS 4.8CVE-2026-104907

MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler

Answer in brief

CVE-2026-104907 records a Medium severity (CVSS 4.8) vulnerability in MISP: JavaScript Injection via Remote Tag ID in Event Preview Inline Handler. 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 4.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.8. 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 vulnerability is remediated by casting the remote tag ID to an integer before embedding it in the inline JavaScript onclick handler. This ensures only a numeric value is rendered, eliminating the possibility of breaking out of the JavaScript string context with special characters.

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 remote event preview page. When a linked (remote) MISP server is configured, the event preview renders tag identifiers inside an inline JavaScript onclick attribute. The tag ID value was HTML-escaped but not sanitized for the JavaScript string context, meaning a malicious linked server could supply a tag ID containing characters (such as a single quote) that break out of the JavaScript string literal and inject arbitrary script. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The linked server supplies a crafted tag ID in an event. - An authenticated user views the event preview and interacts with the affected tag element. Impact: - Arbitrary JavaScript execution in the context of the viewing user's browser session, potentially allowing session hijacking, data exfiltration, or unauthorized actions on behalf of the user. Affected versions: MISP prior to the fix commit (v2.5.48 or later, exact boundary unconfirmed).

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 TAXII Object Viewer Stored XSS via Unescaped JSON OutputSame 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, CWE-116
Source
CVE List V5
Source checked
Oct 2, 2026
References
1 linked source
Open source record