GCVE-1-2026-20327 (CVE-2026-112188)

Vulnerability from gna-1 – Published: 2026-10-19 09:22 – Updated: 2026-10-19 09:22
VLAI
Title
MISP Server Settings Lookup Exposes Sensitive Configuration Data via Branch Name Resolution
Summary
MISP contains a vulnerability in its server settings lookup mechanism that allows an authenticated user to retrieve sensitive configuration data that should have been redacted. The settings lookup function resolves a dotted setting name to a node in the configuration tree. When a branch name (such as Security, MISP, or Plugin) is supplied instead of a specific leaf setting, the function returns the entire sub-tree. Because a branch node does not carry a redaction flag, the redaction check in the settings retrieval endpoint is bypassed, and the full branch contents are returned to the caller. This exposes sensitive values including the security salt, Redis connection passwords, and plugin API keys. A second endpoint that edits server settings similarly reads the entire configuration store when a branch name is resolved, returning all settings to the caller. The impact is disclosure of sensitive server configuration secrets to any user who can access the server settings endpoints. Affected versions: <2.5.48.
Severity
7.1 (High)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: total
Supplier · CNA (v2.0.3)
Decision recorded 2026-10-19 09:21 UTC
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-285 - Improper Authorization
Assigner
CIRCL GNA GNA-1
GNA scorecard A 90/100 over 252 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
MISP MISP Affected: 0 , < 2.5.48 (semver)
    cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Jeroen Pinoy iglocska Claude Opus 5
GCVE extensions
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 2026-10-19 09:21
Model
qwen3.8:27b
Input
https://github.com/MISP/MISP/commit/30b849102.patch 70885748c270…
Confidence
medium
Commit Subject Patch SHA-256
30b849102c68 fix: [settings] Server setting lookups address one setting, 70885748c270…
Fix summary

The settings lookup function now validates that the resolved node is a leaf setting (has a 'level' property and is not an array representing a branch). If the resolved node is a branch or otherwise does not represent a single setting, the function returns false, indicating an invalid setting. This prevents the redaction check from being bypassed and stops the endpoints from returning entire configuration branches containing sensitive values.

Patch summary

In app/Model/Server.php, the getSettingData() method previously checked only for the presence of a 'level' key before returning the setting. The patch adds a guard clause: if the resolved setting is an array (i.e., a branch/sub-tree) or lacks the 'level' key, the function immediately returns false. The existing logic for setting the name and resolving options is then applied only to confirmed leaf settings. This ensures callers that assumed a single-setting result never receive a multi-key branch.

CVSS rationale

AV:N: MISP is a network-accessible web application. AC:L: The attack requires only substituting a branch name for a leaf setting name in an existing API call; no race conditions or complex timing are needed. AT:N: No manipulation of the target environment is required. PR:L: The attacker needs an authenticated account with access to the server settings endpoints; the exact privilege level (admin vs. regular user) is not confirmed in the patch, so Low is assumed. UI:N: No victim interaction is required. VC:H: Sensitive secrets (security salt, Redis passwords, plugin API keys) are fully disclosed. VI:N, VA:N: No integrity or availability impact is evidenced. SC:N, SI:N, SA:N: No impact on subsequent components is indicated.

Weakness rationale
  • CWE-200 The settings endpoint returned sensitive configuration values (security salt, Redis passwords, plugin API keys) to a caller who requested a branch name, bypassing the intended redaction mechanism. The data was exposed to an actor who should not have had access to those specific values.
  • CWE-285 The redaction check, which serves as an authorization control for sensitive setting values, was effectively bypassed because branch nodes do not carry a redacted flag. The system failed to enforce the intended access restriction on sensitive configuration data.
Attack pattern rationale
  • CAPEC-124 The attacker manipulates the setting name parameter supplied to the settings lookup endpoint, substituting a branch name (e.g., 'Security') for a leaf setting name. This causes the application to return a broader data set than intended. CAPEC-124 is the closest match because the core technique is altering a request parameter to change the application's response scope. The mapping is approximate because the parameter is not a traditional HTTP parameter but an application-level setting identifier; no CAPEC specifically covers configuration-tree traversal.
Assumptions to verify
  • The exact privilege level required to access the server settings endpoints (admin vs. any authenticated user) is not stated in the patch; PR:L is assumed as the most conservative defensible value.
  • The affected version boundary is inferred from the tag_version_boundary metadata (v2.5.48 with 11 commits after fix); the exact last affected version and first fixed version are not explicitly confirmed.
  • CAPEC-124 (Parameter Tampering) is the closest available attack pattern; no CAPEC specifically models configuration-tree branch traversal, so the mapping is approximate.
  • The patch does not indicate whether unauthenticated access is possible; authentication is assumed based on the nature of server settings endpoints in MISP.
  • The Co-Authored-By line references an AI tool (Claude Opus 5); it is listed as a tool credit rather than a human remediation developer.
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
  1. 2026-09-28 10:03 UTC Fix developed Corrective change authored (30b849102c687bb53919f1d5d20851bc20fafa4e): fix: [settings] Server setting lookups address one setting,
To clipboard 

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