Vulnerability-Lookup

GHSA-X6Q8-3WFM-G2W6

Vulnerability from github – Published: 2026-10-02 18:31 – Updated: 2026-10-02 18:31

Details

Preconditions:

The victim must be an authenticated MISP user with access to the TAXII object viewer.
The victim must open or view the crafted TAXII object.

Impact:

Execution of arbitrary JavaScript in the victim's browser within the MISP application context.
Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.
Potential for performing actions on behalf of the authenticated user.

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-104906"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-02T16:16:48Z",
    "severity": "MODERATE"
  },
  "details": "MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim\u0027s MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim\u0027s MISP session.\n\nPreconditions:\n\n- The victim must be an authenticated MISP user with access to the TAXII object viewer.\n\n- The victim must open or view the crafted TAXII object.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the victim\u0027s browser within the MISP application context.\n\n- Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface.\n\n- Potential for performing actions on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.",
  "id": "GHSA-x6q8-3wfm-g2w6",
  "modified": "2026-10-02T18:31:27Z",
  "published": "2026-10-02T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104906"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MISP/MISP/commit/1bed4ca0c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/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-2026-104906 (GCVE-0-2026-104906)

Vulnerability from cvelistv5 – Published: 2026-10-02 15:49 – Updated: 2026-10-02 16:17

Title

MISP TAXII Object Viewer Stored XSS via Unescaped JSON Output

Summary

MISP contains a cross-site scripting (XSS) vulnerability in the TAXII object viewer. When displaying a remote TAXII object, the JSON content of string properties was rendered directly into an HTML pre block without HTML-encoding. An attacker who can control or influence the content of a TAXII object (e.g., by publishing a malicious object to a TAXII server that the victim's MISP instance subscribes to) can inject arbitrary HTML or JavaScript that executes in the context of the victim's MISP session. Preconditions: - The victim must be an authenticated MISP user with access to the TAXII object viewer. - The victim must open or view the crafted TAXII object. Impact: - Execution of arbitrary JavaScript in the victim's browser within the MISP application context. - Potential theft of session tokens, API keys, or other sensitive data accessible from the MISP interface. - Potential for performing actions on behalf of the authenticated user. 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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

Supplier · CIRCL (v2.0.3)

Decision recorded 2026-10-02 15:47 UTC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-02 16:17 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

CIRCL ENISA root Scorecard

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/1bed4ca0c	patch

Impacted products

1 product

Vendor	Product	Version
MISP	MISP	Affected: 0 , < 2.5.48 (semver) cpe:2.3:a:misp:misp::::::::

Credits

Jeroen Pinoy iglocska Claude Opus 5.5 (1M context)

GCVE extensions

AI-generated Human-reviewed Confidence: high Model qwen3.8:27b 1 event advisory bcp-05-x-01bcp-05-x-02bcp-05-x-03

bcp-05-x-01

AI-assisted vulnerability information annotation

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`

bcp-05-x-02

Patch-to-vulnerability generation provenance

GCVE-BCP-05-X-02

Generator: patch2vuln.py on 2026-10-02 15:47
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/1bed4ca0c.patch 6f48e50f2a68…
Confidence: high

Commit	Subject	Patch SHA-256
`1bed4ca0c990`	fix: [security] Escape the JSON shown in the generic JSON	`6f48e50f2a68…`

Fix summary

The fix applies HTML-encoding (via the h() helper) to the JSON string before it is interpolated into the HTML pre element. This ensures that any HTML or script markup present in the JSON string properties of a TAXII object is rendered as inert text rather than being parsed and executed by the browser, eliminating the XSS vector.

Patch summary

In app/View/Elements/genericElements/json.ctp, the sprintf call that builds the pre tag was changed from json_encode($json) to h(json_encode($json)). The h() function (CakePHP's HTML-encoding helper, equivalent to htmlspecialchars) now escapes angle brackets, ampersands, and quotes in the JSON output before it is placed inside the HTML pre element. One line changed, one file affected.

CVSS rationale

AV:N: The vulnerability is exploitable over the network via the MISP web interface. AC:L: No race conditions or special timing required; simply viewing the object triggers the XSS. AT:N: The malicious payload is already embedded in the TAXII object; no manipulation of the attack target is needed at exploit time. PR:L: The attacker needs a MISP account (or the ability to publish to a subscribed TAXII server) to place the payload. UI:A: The victim must actively open/view the TAXII object in the viewer. VC/VI/VA:N: The MISP server itself is not compromised; the impact is client-side. SC:H: An attacker can read session cookies, API tokens, and data visible in the MISP UI. SI:H: An attacker can perform actions as the authenticated user (create/modify objects, change settings). SA:N: No denial-of-service impact on the system.

Weakness rationale

CWE-79 The patch directly addresses the failure to HTML-encode untrusted JSON data before embedding it in an HTML context. The h() wrapper is the canonical fix for CWE-79 in CakePHP applications. The data originates from external TAXII objects and is rendered without encoding, allowing script injection.

Attack pattern rationale

CAPEC-66 The attack pattern involves injecting script-enabled content into a web page via untrusted data (TAXII object string properties) that is rendered without encoding. CAPEC-66 is the most specific CAPEC for XSS. The uncertainty is that the exact delivery mechanism (stored in a TAXII server vs. reflected) is not fully specified in the patch, but the core pattern of unencoded user-controlled data in an HTML context matches CAPEC-66 precisely.

Assumptions to verify

The affected version boundary (< 2.5.48) is inferred from the tag_version_boundary metadata (v2.5.48, 29 commits after fix); the patch metadata does not explicitly state a fixed version.
PR:L assumes the TAXII object viewer requires authenticated access to MISP; if the viewer is accessible without authentication, PR would be None.
The CAPEC-66 mapping is the closest available pattern for XSS; the exact delivery vector (stored via TAXII server vs. reflected) is not fully specified in the patch, but the core unencoded-output pattern is unambiguous.
The Co-Authored-By line references an AI assistant (Claude Opus 5.5); it is credited as a tool rather than a human remediation developer.
UI:A assumes the victim must actively navigate to and render the specific TAXII object; if the object is auto-loaded in a dashboard, UI could be None.

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`	8	11	high	5

bcp-05-x-03

Vulnerability handling and disclosure timeline

GCVE-BCP-05-X-03

2026-09-24 21:24 UTC Fix developed Corrective change authored (1bed4ca0c990a4c285e8caa1d7efd91fec43eaca): fix: [security] Escape the JSON shown in the generic JSON https://github.com/MISP/MISP/commit/1bed4ca0c.patch

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JSON

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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-X6Q8-3WFM-G2W6

CVE-2026-104906 (GCVE-0-2026-104906)

AI-assisted vulnerability information annotation

Patch-to-vulnerability generation provenance

Fix summary

Patch summary

CVSS rationale

Weakness rationale

Attack pattern rationale

Assumptions to verify

Model comparison

Vulnerability handling and disclosure timeline

Tags

Sightings

Nomenclature

Related by attack behaviour