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Back to active CVEs
Medium · CVSS 5.3CVE-2026-104900

MISP Stored XSS via Unescaped Count Field Value in Remote Event Preview Index

Answer in brief

CVE-2026-104900 records a Medium severity (CVSS 5.3) vulnerability in MISP Stored XSS via Unescaped Count Field Value in Remote Event Preview Index. 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 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. 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 applying HTML entity encoding to the count field value before it is rendered in the view template. This ensures that any HTML or script markup contained in the value from a remote server is neutralized and displayed as inert text rather than being interpreted by the browser.

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 stored cross-site scripting (XSS) vulnerability in the index table rendering of the remote event preview. The count field template escaped the associated link URL but rendered the field value without HTML encoding. An attacker with the ability to create or modify events on a linked (remote) MISP server could craft an event identifier containing HTML or JavaScript markup. When a user on the local MISP instance views the remote event preview index, the unescaped value is rendered directly in the browser, allowing arbitrary script execution in the victim's session. Preconditions: - A linked/remote MISP server is configured and connected to the local instance. - The attacker has sufficient access on the linked server to create or modify an event with a crafted identifier. - A victim user on the local instance views the remote event preview index page. Impact: - Execution of arbitrary JavaScript in the context of the MISP web application. - Potential session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user. Affected versions: <2.5.48.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • 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: 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