Vulnerability-Lookup

GHSA-7MF5-G482-F646

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

Details

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.

Severity

5.3 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-104900"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-02T16:16:47Z",
    "severity": "MODERATE"
  },
  "details": "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\u0027s session.\n\nPreconditions:\n\n- A linked/remote MISP server is configured and connected to the local instance.\n\n- The attacker has sufficient access on the linked server to create or modify an event with a crafted identifier.\n\n- A victim user on the local instance views the remote event preview index page.\n\nImpact:\n\n- Execution of arbitrary JavaScript in the context of the MISP web application.\n\n- Potential session hijacking, data exfiltration, or unauthorized actions performed on behalf of the authenticated user.\n\nAffected versions: \u003c2.5.48.",
  "id": "GHSA-7mf5-g482-f646",
  "modified": "2026-10-02T18:31:27Z",
  "published": "2026-10-02T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104900"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MISP/MISP/commit/2a2981a27"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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-2026-104900 (GCVE-0-2026-104900)

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

Title

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

Summary

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.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

Supplier · CIRCL (v2.0.3)

Decision recorded 2026-10-01 11:32 UTC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-02 16:14 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/2a2981a27	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: medium 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 2026-10-01 11:32
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/2a2981a27.patch 3c8a41f55b53…
Confidence: medium

Commit	Subject	Patch SHA-256
`2a2981a27bd0`	fix: [security] Escape the value of the count index field	`3c8a41f55b53…`

Fix summary

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.

Patch summary

In the CakePHP view template file app/View/Elements/genericElements/IndexTable/Fields/count.ctp, the assignment of $fieldValue was changed from a raw Hash::extract() call to one wrapped in the h() helper function (CakePHP's HTML-encoding utility). This single-line change ensures the extracted value is HTML-entity-encoded before being used in the template output, preventing injection of markup through the event identifier from a linked server.

CVSS rationale

AV:N - exploitation occurs over the network via a linked MISP server. AC:L - the attacker only needs to craft an event ID with HTML/JS; no race conditions or complex timing. AT:N - the malicious data is stored in the linked server; no active attack is needed at exploitation time. PR:L - the attacker needs low-privilege access to a linked MISP server to create/modify an event. UI:N - the victim only needs to view the remote event preview index page; no special interaction. VC/VI/VA:N - no direct impact on the MISP server's own confidentiality, integrity, or availability. SC:L - XSS allows reading some data (cookies, DOM) in the victim's browser. SI:L - attacker can modify what the victim sees in the browser. SA:N - no impact on security authority of the victim's system.

Weakness rationale

CWE-79 The patch adds HTML encoding (h() function) to a value that was previously rendered raw in an HTML context. The commit message explicitly states the value was printed raw, allowing markup injection. This is a textbook stored/reflected XSS due to missing output encoding.

Attack pattern rationale

CAPEC-1 The attack pattern involves injecting script or markup into a web page through a data field (event ID from a linked server) that is rendered without encoding. CAPEC-1 is the closest standard mapping for XSS via untrusted data rendered in a browser context. The specific vector here is a linked MISP server supplying crafted data, which is a variant of the general XSS injection pattern. No more specific CAPEC precisely captures the 'trusted remote server as injection vector' nuance, so CAPEC-1 is the best available match.

Assumptions to verify

The affected version boundary is inferred from the nearest tag v2.5.48 with 31 commits after the fix; the exact last affected version is not explicitly stated in the patch.
PR:L assumes the attacker needs at least low-privilege access to a linked MISP server to create or modify an event; if no authentication is required on the linked server, PR could be None.
The CAPEC-1 mapping is the closest standard pattern; no CAPEC specifically covers 'XSS via data from a trusted remote server' as a distinct pattern.
The Co-Authored-By line references an AI assistant (Claude Opus 5.5); it is listed as a tool credit rather than a human remediation developer.
The commit date (24 Sep 2026) is in the future relative to typical CVE timelines; this is taken at face value from the patch metadata.

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`	7	11	medium	5

bcp-05-x-03

Vulnerability handling and disclosure timeline

GCVE-BCP-05-X-03

2026-09-24 20:20 UTC Fix developed Corrective change authored (2a2981a27bd06bfd6fa37866db1911637d52538c): fix: [security] Escape the value of the count index field https://github.com/MISP/MISP/commit/2a2981a27.patch

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JSON

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{
  "containers": {
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                "id": "CVE-2026-104900",
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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-7MF5-G482-F646

CVE-2026-104900 (GCVE-0-2026-104900)

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