Vulnerability-Lookup

GHSA-6M7X-X7F7-6WJC

Vulnerability from github – Published: 2026-09-21 15:31 – Updated: 2026-09-21 15:31

Details

MISP contains a DOM-based cross-site scripting (XSS) vulnerability in the contextual menu JavaScript component. The ContextualMenu class populates HTML elements by assigning user-controllable values to the innerHTML property. Because innerHTML parses and renders HTML markup, any untrusted string supplied as the option text (value.text or value) is interpreted as live DOM content rather than plain text. An attacker who can influence the data rendered in the contextual menu can inject arbitrary HTML or JavaScript that executes in the victim's browser within the MISP application origin. This may allow session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user.

Version affected: <2.5.47

Severity

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-94373"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-21T13:17:12Z",
    "severity": "MODERATE"
  },
  "details": "MISP contains a DOM-based cross-site scripting (XSS) vulnerability in the contextual menu JavaScript component. The ContextualMenu class populates HTML \u003coption\u003e elements by assigning user-controllable values to the innerHTML property. Because innerHTML parses and renders HTML markup, any untrusted string supplied as the option text (value.text or value) is interpreted as live DOM content rather than plain text. An attacker who can influence the data rendered in the contextual menu can inject arbitrary HTML or JavaScript that executes in the victim\u0027s browser within the MISP application origin. This may allow session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user.\n\nVersion affected: \u003c2.5.47",
  "id": "GHSA-6m7x-x7f7-6wjc",
  "modified": "2026-09-21T15:31:59Z",
  "published": "2026-09-21T15:31:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94373"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MISP/MISP/commit/b062698f2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-94373 (GCVE-0-2026-94373)

Vulnerability from cvelistv5 – Published: 2026-09-21 12:16 – Updated: 2026-09-21 15:22

Title

MISP DOM-based Cross-Site Scripting via innerHTML in Contextual Menu

Summary

MISP contains a DOM-based cross-site scripting (XSS) vulnerability in the contextual menu JavaScript component. The ContextualMenu class populates HTML <option> elements by assigning user-controllable values to the innerHTML property. Because innerHTML parses and renders HTML markup, any untrusted string supplied as the option text (value.text or value) is interpreted as live DOM content rather than plain text. An attacker who can influence the data rendered in the contextual menu can inject arbitrary HTML or JavaScript that executes in the victim's browser within the MISP application origin. This may allow session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user. Version affected: <2.5.47

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 15:22 UTC

CWE

CWE-79 - Cross-site Scripting (XSS)

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/b062698f2	patch

Impacted products

1 product

Vendor	Product	Version
MISP	MISP	Affected: 0 , < 2.5.47 (semver)

Credits

iglocska 🕵️‍♂️ Jeroen Pinoy 🐞 David Andre

GCVE extensions

AI-generated Confidence: medium Model qwen3.8:27b advisory bcp-05-x-01bcp-05-x-02

AI involvement GCVE-BCP-05-X-01

Whole record AI-generated Review: review 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 2026-09-21 12:08
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/b062698f2.patch 843bc32d5dc3…
Confidence: medium

Commit	Subject	Patch SHA-256
`b062698f2699`	fix: [xss] via JS innerHTML - as reported by David Andre and	`843bc32d5dc3…`

Fix summary

The vulnerability is remediated by replacing the unsafe innerHTML property assignments with the safe textContent property when setting the display text of dynamically created <option> elements. textContent inserts the value as plain text without parsing HTML, thereby neutralizing any injected markup or script.

Patch summary

In app/webroot/js/contextual_menu.js, within the ContextualMenu class, two lines that set option.innerHTML (one for object-valued entries using value.text and one for scalar entries using value) are changed to option.textContent. No other logic, event handlers, or surrounding code is modified. The change is limited to the two assignment statements in the option-population loop.

CVSS rationale

AV:N: MISP is a network-accessible web application. AC:L: The injection is straightforward once attacker-controlled data reaches the menu options. AT:N: No special targeting of a specific session state is required beyond the data being rendered. PR:L: The attacker must be authenticated to MISP to inject data that will be rendered in the contextual menu. UI:P: The victim must interact with the contextual menu (e.g., open it) for the injected content to execute. VC/VI/VA:N: The MISP server itself is not directly compromised. SC:H/SI:H: The victim's browser (subsequent component) suffers high confidentiality and integrity impact via script execution in the MISP origin. SA:N: Availability of the browser is not impacted.

Weakness rationale

CWE-79 The patch replaces innerHTML with textContent to prevent HTML/JS injection into the DOM, which is the canonical remediation for DOM-based XSS (CWE-79). The specific sub-type is DOM-based XSS via unsafe DOM API usage (innerHTML), but CWE-79 is the narrowest standard identifier that covers this.

Attack pattern rationale

CAPEC-12 The vulnerability is a textbook DOM-based XSS: attacker-controlled data is written into the DOM via the innerHTML property, causing the browser to parse and execute injected markup/script. CAPEC-12 (DOM-based XSS) is the most precise CAPEC pattern. The mapping is high-confidence because the patch explicitly targets innerHTML-to-textContent in a client-side JS file, which is the defining characteristic of DOM-based XSS.

Assumptions to verify

The affected version range is inferred from the tag_version_boundary (v2.5.47 with 137 commits after the fix), suggesting the fix landed shortly after v2.5.47; no explicit affected/fixed version strings are provided in the metadata.
PR:L assumes the attacker must be an authenticated MISP user to inject data that reaches the contextual menu; if an unauthenticated injection path exists, PR could be N.
UI:P assumes the victim must actively open or interact with the contextual menu for the XSS to trigger; if the menu renders automatically on page load, UI could be N.
The CAPEC-12 mapping is high-confidence based on the innerHTML-to-textContent pattern, but the exact data flow (which upstream field feeds value.text) is not visible in the patch.
AT:N assumes the attacker does not need to target a specific user's session; if the payload must be tailored to a particular user's view, AT could be P.

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`	5	9	medium	5

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

GHSA-6M7X-X7F7-6WJC

CVE-2026-94373 (GCVE-0-2026-94373)

Fix summary

Patch summary

CVSS rationale

Weakness rationale

Attack pattern rationale

Assumptions to verify

Model comparison

Tags

Sightings

Nomenclature

Related by attack behaviour