MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. (CVE-2026-104907)
MISP has a cross-site scripting (XSS) vulnerability in its remote event preview page. This occurs when a linked remote MISP server supplies a crafted tag ID that is improperly sanitized in JavaScript context. An authenticated user viewing the event preview and interacting with the tag element may have arbitrary JavaScript executed in their browser session. This could lead to session hijacking or unauthorized actions. The vulnerability affects versions prior to the fix commit around v2.5.48, though the exact boundary is unconfirmed.
AI Analysis
Technical Summary
The vulnerability in MISP arises from improper sanitization of tag identifiers rendered inside an inline JavaScript onclick attribute on the remote event preview page. While the tag ID is HTML-escaped, it is not sanitized for JavaScript string context, allowing a malicious linked MISP server to inject script by breaking out of the string literal. Preconditions include having a linked remote MISP server configured and an authenticated user interacting with the crafted tag element. This results in arbitrary JavaScript execution in the user's browser session.
Potential Impact
An attacker controlling a linked remote MISP server can supply malicious tag IDs that execute arbitrary JavaScript in the context of an authenticated user's browser session. This can lead to session hijacking, data exfiltration, or unauthorized actions performed on behalf of the user. The impact is limited to users who view and interact with the affected event preview page and tag elements.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The description references a fix commit around version 2.5.48, but the exact fixed version is unconfirmed. Until a confirmed patch is available, avoid interacting with event previews from untrusted linked MISP servers. Monitor vendor advisories for official fixes.
MISP contains a cross-site scripting (XSS) vulnerability in the remote event preview page. (CVE-2026-104907)
Description
MISP has a cross-site scripting (XSS) vulnerability in its remote event preview page. This occurs when a linked remote MISP server supplies a crafted tag ID that is improperly sanitized in JavaScript context. An authenticated user viewing the event preview and interacting with the tag element may have arbitrary JavaScript executed in their browser session. This could lead to session hijacking or unauthorized actions. The vulnerability affects versions prior to the fix commit around v2.5.48, though the exact boundary is unconfirmed.
CVSS v4.0
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in MISP arises from improper sanitization of tag identifiers rendered inside an inline JavaScript onclick attribute on the remote event preview page. While the tag ID is HTML-escaped, it is not sanitized for JavaScript string context, allowing a malicious linked MISP server to inject script by breaking out of the string literal. Preconditions include having a linked remote MISP server configured and an authenticated user interacting with the crafted tag element. This results in arbitrary JavaScript execution in the user's browser session.
Potential Impact
An attacker controlling a linked remote MISP server can supply malicious tag IDs that execute arbitrary JavaScript in the context of an authenticated user's browser session. This can lead to session hijacking, data exfiltration, or unauthorized actions performed on behalf of the user. The impact is limited to users who view and interact with the affected event preview page and tag elements.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The description references a fix commit around version 2.5.48, but the exact fixed version is unconfirmed. Until a confirmed patch is available, avoid interacting with event previews from untrusted linked MISP servers. Monitor vendor advisories for official fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4g8m-xfv2-jhr3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-104907"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 4.0
Threat ID: 6ac00d23a43b0b3b89fb147a
Added to database: 10/02/2026, 19:59:31 UTC
Last enriched: 10/02/2026, 20:03:12 UTC
Last updated: 10/03/2026, 03:16:22 UTC
Views: 10
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