Vulnerability-Lookup

GHSA-C2R5-M9W2-228Q

Vulnerability from github – Published: 2026-09-22 18:33 – Updated: 2026-09-22 18:33

Details

A typo in the MISP ACLComponent access control configuration caused the ACL rule for the previewEventAttributes action to reference the permission string 'theming_enabled' (with a trailing asterisk) instead of the correct 'theming_enabled'. In the MISP ACL system, the array values define which role or permission grants access to a given controller action. The adjacent entry previewEventObjects correctly uses ['theming_enabled'], confirming the intended restriction. The malformed key 'theming_enabled' does not match any valid permission identifier, causing the access control check for previewEventAttributes to malfunction. Depending on the ACL evaluation logic, this could result in either unauthorized users gaining access to the previewEventAttributes endpoint (authorization bypass) or legitimate users being denied access (availability impact).

The previewEventAttributes endpoint exposes event attribute data within MISP so an authorization bypass could expose sensitive indicator and attribute data to users who should not have access.

Severity

5.3 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-95805"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-22T16:18:24Z",
    "severity": "MODERATE"
  },
  "details": "A typo in the MISP ACLComponent access control configuration caused the ACL rule for the previewEventAttributes action to reference the permission string \u0027theming_enabled*\u0027 (with a trailing asterisk) instead of the correct \u0027theming_enabled\u0027. In the MISP ACL system, the array values define which role or permission grants access to a given controller action. The adjacent entry previewEventObjects correctly uses [\u0027theming_enabled\u0027], confirming the intended restriction. The malformed key \u0027theming_enabled*\u0027 does not match any valid permission identifier, causing the access control check for previewEventAttributes to malfunction. Depending on the ACL evaluation logic, this could result in either unauthorized users gaining access to the previewEventAttributes endpoint (authorization bypass) or legitimate users being denied access (availability impact).\u00a0\n\nThe previewEventAttributes endpoint exposes event attribute data within MISP so an authorization bypass could expose sensitive indicator and attribute data to users who should not have access.",
  "id": "GHSA-c2r5-m9w2-228q",
  "modified": "2026-09-22T18:33:30Z",
  "published": "2026-09-22T18:33:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-95805"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MISP/MISP/commit/5ac8d1e4d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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-2026-95805 (GCVE-0-2026-95805)

Vulnerability from cvelistv5 – Published: 2026-09-22 14:59 – Updated: 2026-09-22 15:53

Title

MISP ACLComponent: Typo in previewEventAttributes ACL key bypasses intended access restriction

Summary

A typo in the MISP ACLComponent access control configuration caused the ACL rule for the previewEventAttributes action to reference the permission string 'theming_enabled*' (with a trailing asterisk) instead of the correct 'theming_enabled'. In the MISP ACL system, the array values define which role or permission grants access to a given controller action. The adjacent entry previewEventObjects correctly uses ['theming_enabled'], confirming the intended restriction. The malformed key 'theming_enabled*' does not match any valid permission identifier, causing the access control check for previewEventAttributes to malfunction. Depending on the ACL evaluation logic, this could result in either unauthorized users gaining access to the previewEventAttributes endpoint (authorization bypass) or legitimate users being denied access (availability impact). The previewEventAttributes endpoint exposes event attribute data within MISP so an authorization bypass could expose sensitive indicator and attribute data to users who should not have access.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 15:53 UTC

CWE

CWE-285 - Improper Authorization

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/5ac8d1e4d	patch

Impacted products

1 product

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

Credits

Thomas Lacroix

GCVE extensions

AI-generated Human-reviewed 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 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 2026-09-22 14:55
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/5ac8d1e4d.patch c102952ebfab…
Confidence: medium

Commit	Subject	Patch SHA-256
`5ac8d1e4dea7`	fix: [ACL] typo in previewEventAttributes key	`c102952ebfab…`

Fix summary

The fix corrects the ACL permission key for the previewEventAttributes action from the malformed string 'theming_enabled*' to the correct 'theming_enabled', restoring the intended access control restriction so that only users holding the theming_enabled permission can invoke the endpoint, consistent with the adjacent previewEventObjects entry.

Patch summary

In app/Controller/Component/ACLComponent.php (line 473), the ACL array value for the 'previewEventAttributes' key was changed from ['theming_enabled*'] to ['theming_enabled'], removing the erroneous trailing asterisk that made the permission string non-matching. One line changed, one insertion, one deletion.

CVSS rationale

AV:N: MISP is a network-accessible web application. AC:L: The vulnerability is a static typo in configuration; no race or complex condition is needed. AT:N: No attack target manipulation required. PR:L: The attacker must be an authenticated MISP user to reach the endpoint. UI:N: No victim interaction needed. VC:L: If the ACL bypass is confirmed, an unauthorized user could view event attribute data (limited confidentiality impact). VI:N and VA:N: No integrity or availability impact is evident from the patch. SC/SI/SA:N: No secondary system impact. The overall severity is Low, reflecting a single-endpoint access control misconfiguration with limited data exposure.

Weakness rationale

CWE-285 The ACL rule for previewEventAttributes contained a typo ('theming_enabled*') that prevented the authorization check from matching the intended permission, causing the access control mechanism to not enforce the restriction as designed. This is a direct failure of the authorization logic due to a misconfigured rule.

Attack pattern rationale

CAPEC-126 The closest plausible attack pattern is Forced Browsing, where an attacker accesses a resource (the previewEventAttributes endpoint) that should be restricted by the ACL. The typo in the ACL key may cause the authorization check to fail to deny access, effectively allowing a user without the theming_enabled permission to reach the endpoint. Uncertainty: the exact ACL evaluation behavior on a non-matching rule (default-deny vs. default-allow) is not visible in the patch, so it is also possible the typo causes a denial rather than a bypass. CAPEC-126 is selected as the best available match for an access-control bypass via misconfiguration.

Assumptions to verify

The exact ACL evaluation behavior when a permission string does not match any valid role (default-deny vs. default-allow) is not visible in the patch; the CVSS assumes the more security-relevant interpretation (authorization bypass) but a denial-of-service interpretation is also possible.
The affected version range is inferred from the tag boundary v2.5.47 (227 commits after the fix); the exact first affected version is not stated in the patch.
The CAPEC-126 mapping is the closest available pattern; the actual attack is a configuration typo rather than an active browsing technique, so the mapping is approximate.
The security impact is assumed to be limited to the previewEventAttributes endpoint; no evidence in the patch suggests other endpoints or data stores are affected.
The CVSS assumes the endpoint exposes event attribute data viewable by unauthorized users; the actual data sensitivity depends on MISP deployment configuration.

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

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Action not permitted

GHSA-C2R5-M9W2-228Q

CVE-2026-95805 (GCVE-0-2026-95805)

Fix summary

Patch summary

CVSS rationale

Weakness rationale

Attack pattern rationale

Assumptions to verify

Model comparison

Tags

Sightings

Nomenclature

Related by attack behaviour