GCVE-1-2026-20142 (CVE-2026-103389)

Vulnerability from gna-1 – Published: 2026-09-30 14:25 – Updated: 2026-09-30 14:25
VLAI
Title
MISP Stored Cross-Site Scripting via Unvalidated Galaxy Icon Field in Correlation Graph
Summary
MISP contains a stored cross-site scripting (XSS) vulnerability in the galaxy icon handling path. The icon field of a galaxy object was persisted without any server-side validation through the galaxy add, edit, and sync/import capture endpoints. The stored value was subsequently concatenated directly into HTML markup by the D3-based correlation graph rendering scripts (both the default and Overmind themes) using the .html() method. A user holding the perm_galaxy_editor permission, which is granted to the stock User role, could store arbitrary HTML or JavaScript in the icon field. Any other user who opened the correlation graph of an event containing a cluster belonging to that galaxy would have the injected script executed in their browser session. Impact: - Arbitrary script execution in the context of the victim's MISP session - Potential theft of session credentials, manipulation of displayed data, or initiation of actions on behalf of the victim - Affects both the default and Overmind UI themes Affected versions: <2.5.48
Severity
6.2 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-20 - Improper Input Validation
Assigner
GNA-1 This instance Scorecard
References
Impacted products
Vendor Product Version CPE status
MISP MISP Affected: 0 , < 2.5.48 (semver)
    cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Jeroen Pinoy iglocska Claude Fable 5.1
GCVE extensions
AI involvement GCVE-BCP-05-X-01
Whole record AI-generated Human-reviewed GNA-1

Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.

ai-computer-assisted:llm-generatedai-computer-assisted:classification
Model Source Identifier
qwen3.8:27b ollama qwen3.8:27b
Patch provenance GCVE-BCP-05-X-02
Generator
patch2vuln.py on 2026-09-30 14:24
Model
qwen3.8:27b
Input
https://github.com/MISP/MISP/commit/8ea5783dd.patch 382869c811e8…
Confidence
high
Commit Subject Patch SHA-256
8ea5783ddcfe fix: [security] Galaxy icons are icon names, and the 382869c811e8…
Fix summary

The vulnerability is remediated by enforcing strict input validation on the galaxy icon field so that only valid Font Awesome icon names (lowercase alphanumeric characters and dashes) are accepted at write time. The sync/import capture path discards any icon value that does not conform. The correlation graph JSON generation falls back to a safe default icon for any previously stored invalid value. On the client side, both correlation graph scripts now set the icon as a CSS class attribute rather than injecting it as raw HTML, and apply an additional regex sanitization pass. The asset cache-busting version is incremented to ensure browsers load the corrected scripts.

Patch summary

Added a static isValidIconName() method and a regex constant (ICON_NAME_PATTERN) to the Galaxy model, plus a model-level validation rule restricting the icon field to lowercase letters, digits, and dashes. The captureGalaxy() method now blanks out any icon value that fails validation before persistence. CorrelationGraphTool::__createNode() now checks the icon against the validator and substitutes 'globe' for invalid stored values. Both correlation-graph.js and correlation-graphOvermind.js were changed from .html() string concatenation to .attr('class', ...) with a regex strip of non-conforming characters. AppController asset query version bumped from 225 to 226. A new PHPUnit test file (GalaxyIconNameTest.php) validates the icon name rule against known-good and known-bad payloads including the originally reported XSS vector.

CVSS rationale

AV:N: exploited over the network via the MISP web interface. AC:L: no race conditions or special timing; simply set the icon field and wait for a victim to view the graph. AT:N: no manipulation of the attack target required. PR:L: requires an authenticated user with perm_galaxy_editor, which is the default stock User role. UI:A: the victim must actively open the correlation graph of an event containing the affected galaxy cluster. VC/VI/VA:N: the server-side application is not directly compromised; the impact is on the victim's browser session. SC:H: script execution in the victim's session can read cookies, tokens, and sensitive page data. SI:H: the attacker can modify the victim's view, inject content, or trigger actions. SA:N: no availability impact on the system.

Weakness rationale
  • CWE-79 The galaxy icon field was stored without validation and later rendered into the DOM via D3 .html(), allowing an attacker to inject and execute arbitrary script in the victim's browser. This is a textbook stored XSS.
  • CWE-20 The root enabler is the absence of any server-side validation on the icon field at write time (add, edit, capture). The field accepted arbitrary strings including HTML markup, which was the precondition for the XSS.
Attack pattern rationale
  • CAPEC-1 The attack pattern is a stored XSS: an authenticated user with galaxy editor permission injects a script payload into a persistent data field (galaxy icon), which is later rendered unsanitized in another user's browser via the correlation graph. CAPEC-1 is the closest and most direct match. No more specific CAPEC entry for stored XSS via a data field rendered by a graphing library exists in the CAPEC catalog, so CAPEC-1 is the best available mapping.
Assumptions to verify
  • The affected version boundary is inferred from the tag_version_boundary metadata indicating the fix commit precedes v2.5.48 by 20 commits; no explicit 'fixed in' version is stated in the patch itself.
  • The perm_galaxy_editor permission is assumed to be granted to the stock User role as stated in the commit message; the exact role-permission mapping was not independently verified from the patch.
  • CAPEC-1 is the closest available mapping; no CAPEC entry specifically describes stored XSS via a graph-rendering library data field, so the general Cross Site Scripting pattern is used.
  • CVSS UI:A assumes the victim must navigate to the correlation graph view of a specific event; if the graph is auto-loaded on a commonly visited page, UI could be lowered to Passive.
  • The Co-Authored-By line references an AI assistant (Claude Fable 5.1); it is recorded as a tool credit rather than a human remediation developer.
Model comparison

Selected qwen3.8:27b by deterministic-consensus-v1
The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.

Model Score Agreement Confidence Assumptions
qwen3.8:27b 6 9 high 5
To clipboard 

{
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            "cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"
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            "Correlation Graph (default theme)",
            "Correlation Graph (Overmind theme)",
            "Galaxy sync/import capture"
          ],
          "product": "MISP",
          "programFiles": [
            "app/Model/Galaxy.php",
            "app/Lib/Tools/CorrelationGraphTool.php",
            "app/webroot/js/correlation-graph.js",
            "app/webroot/js/correlation-graphOvermind.js"
          ],
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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          "value": "Jeroen Pinoy"
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              "value": "\u003cp\u003eMISP contains a stored cross-site scripting (XSS) vulnerability in the galaxy icon handling path. The icon field of a galaxy object was persisted without any server-side validation through the galaxy add, edit, and sync/import capture endpoints. The stored value was subsequently concatenated directly into HTML markup by the D3-based correlation graph rendering scripts (both the default and Overmind themes) using the .html() method.\u003c/p\u003e\u003cp\u003eA user holding the perm_galaxy_editor permission, which is granted to the stock User role, could store arbitrary HTML or JavaScript in the icon field. Any other user who opened the correlation graph of an event containing a cluster belonging to that galaxy would have the injected script executed in their browser session.\u003c/p\u003e\u003cp\u003eImpact:\u003c/p\u003e\u003cp\u003e- Arbitrary script execution in the context of the victim\u0027s MISP session\u003c/p\u003e\u003cp\u003e- Potential theft of session credentials, manipulation of displayed data, or initiation of actions on behalf of the victim\u003c/p\u003e\u003cp\u003e- Affects both the default and Overmind UI themes\u003c/p\u003e\u003cp\u003eAffected versions: \u0026lt;2.5.48\u003c/p\u003e"
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              "type": "text/html",
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        }
      ],
      "title": "MISP Stored Cross-Site Scripting via Unvalidated Galaxy Icon Field in Correlation Graph",
      "x_gcve": [
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          "extensions": {
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                  "The perm_galaxy_editor permission is assumed to be granted to the stock User role as stated in the commit message; the exact role-permission mapping was not independently verified from the patch.",
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                "fixSummary": "The vulnerability is remediated by enforcing strict input validation on the galaxy icon field so that only valid Font Awesome icon names (lowercase alphanumeric characters and dashes) are accepted at write time. The sync/import capture path discards any icon value that does not conform. The correlation graph JSON generation falls back to a safe default icon for any previously stored invalid value. On the client side, both correlation graph scripts now set the icon as a CSS class attribute rather than injecting it as raw HTML, and apply an additional regex sanitization pass. The asset cache-busting version is incremented to ensure browsers load the corrected scripts.",
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                "patchSummary": "Added a static isValidIconName() method and a regex constant (ICON_NAME_PATTERN) to the Galaxy model, plus a model-level validation rule restricting the icon field to lowercase letters, digits, and dashes. The captureGalaxy() method now blanks out any icon value that fails validation before persistence. CorrelationGraphTool::__createNode() now checks the icon against the validator and substitutes \u0027globe\u0027 for invalid stored values. Both correlation-graph.js and correlation-graphOvermind.js were changed from .html() string concatenation to .attr(\u0027class\u0027, ...) with a regex strip of non-conforming characters. AppController asset query version bumped from 225 to 226. A new PHPUnit test file (GalaxyIconNameTest.php) validates the icon name rule against known-good and known-bad payloads including the originally reported XSS vector.",
                "patchTruncated": false,
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  "cveMetadata": {
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    "cveId": "CVE-2026-103389",
    "datePublished": "2026-09-30T14:25:50.603841Z",
    "dateReserved": "2026-09-30T14:25:56.802Z",
    "dateUpdated": "2026-09-30T14:25:57.591909Z",
    "state": "PUBLISHED",
    "vulnId": "GCVE-1-2026-20142"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.