CVE-2026-112178 (GCVE-0-2026-112178)
Vulnerability from cvelistv5 – Published: 2026-10-19 08:50 – Updated: 2026-10-19 17:20
VLAI
EPSS
VEX
Title
MISP Proposal ACL Bypass: Incomplete Distribution Level Check in Shadow Attribute Access Control
Summary
MISP contains an access control flaw in the proposal (shadow attribute) visibility logic. The authorization check accepted any attribute or object carrying one of the user's sharing groups without verifying the distribution level, and denied the owning organisation access to proposals on its own organisation-only attributes.
- A user belonging to a sharing group could view proposals on attributes or objects with that sharing group, regardless of the attribute's distribution level (levels 1-3 should restrict visibility)
- The owning organisation could not view proposals on its own org-only attributes
Security impact: Unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions.
Affected: <2.5.48
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
Supplier · CIRCL (v2.0.3)
Decision recorded 2026-10-19 08:49 UTC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 17:20 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/9c5af321f | patch |
Impacted products
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
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 |
- Generator
-
patch2vuln.pyon 2026-10-19 08:49 - Model
qwen3.8:27b- Input
-
https://github.com/MISP/MISP/commit/9c5af321f.patch
c50a0b040ef7… - Confidence
- medium
| Commit | Subject | Patch SHA-256 |
|---|---|---|
9c5af321fe8f
|
fix: [proposals] Apply the attribute ACL rules to proposals | c50a0b040ef7… |
Fix summary
The fix enforces the distribution level constraint in the sharing group access check, requiring distribution level 4 (All communities) for the sharing group test to apply. Additionally, the owning organisation is now explicitly granted access to proposals on its own attributes regardless of distribution level, correcting the over-restrictive behavior.
Patch summary
In the shadow attribute model's condition builder, the sharing group check for both objects and attributes now includes an AND condition requiring distribution = 4 alongside the sharing_group_id IN check. The attribute distribution condition was changed from a simple sharing_group_id IN clause to a compound AND condition with distribution = 4. A new OR condition (Event.org_id matching the user's org_id) was added to grant the owning organisation access to proposals on its own attributes.
CVSS rationale
AV:N: MISP is a network-accessible web application. AC:L: The user only needs to be a member of a sharing group; no special conditions or race conditions are required. AT:N: No active attack requirements beyond normal API usage. PR:L: The attacker must be an authenticated user with membership in a relevant sharing group. UI:N: No user interaction is required; the check is server-side. VC:H: The user can view proposals (proposed attribute changes) that should be restricted by distribution level, disclosing sensitive information about proposed changes. VI:N: No integrity impact; the user cannot modify proposals. VA:N: No availability impact. SC/SI/SA:N: No impact on subsequent components.
Weakness rationale
- CWE-862 The authorization check for proposal visibility was missing the distribution level constraint. The system evaluated sharing group membership as sufficient for access without also requiring the distribution level to be 4 (All communities), resulting in an incomplete authorization check that allowed access to proposals on more restrictively distributed attributes.
Attack pattern rationale
- CAPEC-2 The user's sharing group membership (a parameter of their identity/session) was leveraged by the flawed authorization logic to grant access to proposals without the required distribution level check. This is the closest available CAPEC pattern; the user is not actively tampering with parameters, but the system improperly treats group membership as a sufficient access parameter without enforcing the additional distribution constraint. The mapping is uncertain because the vulnerability is more accurately a missing authorization check than active parameter manipulation.
Assumptions to verify
- The CAPEC mapping (CAPEC-2, Parameter Tampering) is the closest available match but is uncertain; the vulnerability is more accurately a missing authorization check (incomplete ACL evaluation) rather than active parameter manipulation by the attacker.
- The affected version boundary is inferred from the tag v2.5.48 and the commit position (35 commits after the fix); exact version boundaries are not explicitly stated in the patch metadata.
- The second aspect of the vulnerability (owner organisation denied access to its own proposals) is primarily a functional/availability defect rather than a security vulnerability, but is included as part of the same fix and the same root cause (incomplete ACL logic).
- CVSS PR:L assumes the attacker must be an authenticated MISP user with membership in a relevant sharing group; no evidence supports unauthenticated access.
- The Co-Authored-By line credits an AI assistant (Claude Opus 5.5) as a remediation developer; this is recorded as-is from the commit 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 |
- 2026-09-24 14:23 UTC Fix developed Corrective change authored (9c5af321fe8f1d2209c8b3c35f4d570d47e9af9e): fix: [proposals] Apply the attribute ACL rules to proposals https://github.com/MISP/MISP/commit/9c5af321f.patch
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"title": "CISA ADP Vulnrichment"
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],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*"
],
"modules": [
"ShadowAttribute (proposal/shadow attribute handling)"
],
"product": "MISP",
"programFiles": [
"app/Model/ShadowAttribute.php"
],
"repo": "https://github.com/MISP/MISP",
"vendor": "MISP",
"versions": [
{
"lessThan": "2.5.48",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "remediation developer",
"value": "iglocska"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Claude Opus 5.5 (1M context)"
},
{
"lang": "en",
"type": "reporter",
"value": "elhoim"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eMISP contains an access control flaw in the proposal (shadow attribute) visibility logic. The authorization check accepted any attribute or object carrying one of the user\u0027s sharing groups without verifying the distribution level, and denied the owning organisation access to proposals on its own organisation-only attributes.\u003c/p\u003e\u003cp\u003e- A user belonging to a sharing group could view proposals on attributes or objects with that sharing group, regardless of the attribute\u0027s distribution level (levels 1-3 should restrict visibility)\u003c/p\u003e\u003cp\u003e- The owning organisation could not view proposals on its own org-only attributes\u003c/p\u003e\u003cp\u003eSecurity impact: Unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions.\u003c/p\u003e\u003cp\u003eAffected: \u0026lt;2.5.48\u003c/p\u003e"
}
],
"value": "MISP contains an access control flaw in the proposal (shadow attribute) visibility logic. The authorization check accepted any attribute or object carrying one of the user\u0027s sharing groups without verifying the distribution level, and denied the owning organisation access to proposals on its own organisation-only attributes.\n\n- A user belonging to a sharing group could view proposals on attributes or objects with that sharing group, regardless of the attribute\u0027s distribution level (levels 1-3 should restrict visibility)\n\n- The owning organisation could not view proposals on its own org-only attributes\n\nSecurity impact: Unauthorized disclosure of proposed attribute changes to users who should not have access based on distribution level restrictions.\n\nAffected: \u003c2.5.48"
}
],
"impacts": [
{
"capecId": "CAPEC-2",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-2 Parameter Tampering"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"format": "SSVC",
"other": {
"content": {
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "Supplier",
"timestamp": "2026-10-19T08:49:14Z",
"version": "2.0.3"
},
"type": "SSVC"
},
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"description": "CWE-862 Missing Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T08:50:52.402Z",
"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
"shortName": "CIRCL"
},
"references": [
{
"name": "Security patch",
"tags": [
"patch"
],
"url": "https://github.com/MISP/MISP/commit/9c5af321f"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe fix enforces the distribution level constraint in the sharing group access check, requiring distribution level 4 (All communities) for the sharing group test to apply. Additionally, the owning organisation is now explicitly granted access to proposals on its own attributes regardless of distribution level, correcting the over-restrictive behavior.\u003c/p\u003e"
}
],
"value": "The fix enforces the distribution level constraint in the sharing group access check, requiring distribution level 4 (All communities) for the sharing group test to apply. Additionally, the owning organisation is now explicitly granted access to proposals on its own attributes regardless of distribution level, correcting the over-restrictive behavior."
}
],
"title": "MISP Proposal ACL Bypass: Incomplete Distribution Level Check in Shadow Attribute Access Control",
"x_gcve": [
{
"extensions": {
"bcp-05-x-01": {
"ai_annotations": [
{
"ai_level": "generated",
"description": "Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.",
"gna_source": 1,
"models": [
{
"gna_source": 1,
"identifier": "qwen3.8:27b",
"name": "qwen3.8:27b",
"source": "ollama"
}
],
"review_status": "full",
"scope": "record",
"tags": [
"ai-computer-assisted:llm-generated",
"ai-computer-assisted:classification"
]
}
]
},
"bcp-05-x-02": {
"x_patch2vuln": {
"assumptions": [
"The CAPEC mapping (CAPEC-2, Parameter Tampering) is the closest available match but is uncertain; the vulnerability is more accurately a missing authorization check (incomplete ACL evaluation) rather than active parameter manipulation by the attacker.",
"The affected version boundary is inferred from the tag v2.5.48 and the commit position (35 commits after the fix); exact version boundaries are not explicitly stated in the patch metadata.",
"The second aspect of the vulnerability (owner organisation denied access to its own proposals) is primarily a functional/availability defect rather than a security vulnerability, but is included as part of the same fix and the same root cause (incomplete ACL logic).",
"CVSS PR:L assumes the attacker must be an authenticated MISP user with membership in a relevant sharing group; no evidence supports unauthenticated access.",
"The Co-Authored-By line credits an AI assistant (Claude Opus 5.5) as a remediation developer; this is recorded as-is from the commit metadata."
],
"capecRationale": [
{
"capecId": "CAPEC-2",
"rationale": "The user\u0027s sharing group membership (a parameter of their identity/session) was leveraged by the flawed authorization logic to grant access to proposals without the required distribution level check. This is the closest available CAPEC pattern; the user is not actively tampering with parameters, but the system improperly treats group membership as a sufficient access parameter without enforcing the additional distribution constraint. The mapping is uncertain because the vulnerability is more accurately a missing authorization check than active parameter manipulation."
}
],
"commit": "9c5af321fe8f1d2209c8b3c35f4d570d47e9af9e",
"confidence": "medium",
"credits": [
{
"lang": "en",
"type": "remediation developer",
"value": "iglocska"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Claude Opus 5.5 (1M context)"
},
{
"lang": "en",
"type": "reporter",
"value": "elhoim"
}
],
"cvssRationale": "AV:N: MISP is a network-accessible web application. AC:L: The user only needs to be a member of a sharing group; no special conditions or race conditions are required. AT:N: No active attack requirements beyond normal API usage. PR:L: The attacker must be an authenticated user with membership in a relevant sharing group. UI:N: No user interaction is required; the check is server-side. VC:H: The user can view proposals (proposed attribute changes) that should be restricted by distribution level, disclosing sensitive information about proposed changes. VI:N: No integrity impact; the user cannot modify proposals. VA:N: No availability impact. SC/SI/SA:N: No impact on subsequent components.",
"fixSummary": "The fix enforces the distribution level constraint in the sharing group access check, requiring distribution level 4 (All communities) for the sharing group test to apply. Additionally, the owning organisation is now explicitly granted access to proposals on its own attributes regardless of distribution level, correcting the over-restrictive behavior.",
"generatedAt": "2026-10-19T08:49:14.568262Z",
"generator": "patch2vuln.py",
"model": "qwen3.8:27b",
"modelComparison": {
"rankings": [
{
"agreementScore": 11,
"assumptionCount": 5,
"confidence": "medium",
"model": "qwen3.8:27b",
"score": 7
}
],
"selectedModel": "qwen3.8:27b",
"selectionMethod": "deterministic-consensus-v1",
"selectionNotice": "The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required."
},
"patchSha256": "c50a0b040ef7da05d8dffbdc10599991ce441f3fe965e1025620e2e0581b7166",
"patchSummary": "In the shadow attribute model\u0027s condition builder, the sharing group check for both objects and attributes now includes an AND condition requiring distribution = 4 alongside the sharing_group_id IN check. The attribute distribution condition was changed from a simple sharing_group_id IN clause to a compound AND condition with distribution = 4. A new OR condition (Event.org_id matching the user\u0027s org_id) was added to grant the owning organisation access to proposals on its own attributes.",
"patchTruncated": false,
"patches": [
{
"commit": "9c5af321fe8f1d2209c8b3c35f4d570d47e9af9e",
"date": "Thu, 24 Sep 2026 16:23:08 +0200",
"patchSha256": "c50a0b040ef7da05d8dffbdc10599991ce441f3fe965e1025620e2e0581b7166",
"source": "https://github.com/MISP/MISP/commit/9c5af321f.patch",
"sourceUrl": "https://github.com/MISP/MISP/commit/9c5af321f.patch",
"subject": "fix: [proposals] Apply the attribute ACL rules to proposals"
}
],
"source": "https://github.com/MISP/MISP/commit/9c5af321f.patch",
"ssvc": {
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "Supplier",
"timestamp": "2026-10-19T08:49:14Z",
"version": "2.0.3"
},
"subject": "fix: [proposals] Apply the attribute ACL rules to proposals",
"tagVersionBoundary": {
"commits_after_fix": 35,
"repository": "https://github.com/MISP/MISP",
"tag": "v2.5.48",
"version": "2.5.48",
"version_type": "semver"
},
"weaknessRationale": [
{
"cweId": "CWE-862",
"rationale": "The authorization check for proposal visibility was missing the distribution level constraint. The system evaluated sharing group membership as sufficient for access without also requiring the distribution level to be 4 (All communities), resulting in an incomplete authorization check that allowed access to proposals on more restrictively distributed attributes."
}
]
}
},
"bcp-05-x-03": {
"x_timeline": {
"events": [
{
"description": "Corrective change authored (9c5af321fe8f1d2209c8b3c35f4d570d47e9af9e): fix: [proposals] Apply the attribute ACL rules to proposals",
"id": "evt-fix-developed-1",
"references": [
"https://github.com/MISP/MISP/commit/9c5af321f.patch"
],
"timestamp": "2026-09-24T14:23:08Z",
"type": "fix-developed"
}
]
}
}
},
"recordType": "advisory",
"vulnId": "GCVE-1-2026-20337"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
"assignerShortName": "CIRCL",
"cveId": "CVE-2026-112178",
"datePublished": "2026-10-19T08:50:52.402Z",
"dateReserved": "2026-10-19T08:50:50.711Z",
"dateUpdated": "2026-10-19T17:20:40.642Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| 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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
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.
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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.