Vulnerability-Lookup

FKIE_CVE-2026-95693

Vulnerability from fkie_nvd - Published: 2026-09-22 15:17 - Updated: 2026-09-22 16:18

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

Summary

In MISP, the EventReport::uploadPicture method in processed a caller-supplied tmp_name field by invoking file_exists(), mime_content_type(), and exif_imagetype() on the supplied path before verifying that the value was a genuine PHP upload via is_uploaded_file(). An authenticated user holding the perm_add permission could supply an arbitrary filesystem path as the tmp_name value. The application would then probe that path and return distinct validation error messages depending on whether the file existed, its MIME type, or its image format. By observing the differing error responses, an attacker could enumerate the existence of files at arbitrary paths on the MISP server and determine their type. This constitutes an information disclosure vulnerability: the server's filesystem layout and file types are leaked to any user with the perm_add role without requiring administrative access. The vulnerability does not allow reading file contents, writing files, or executing code, but it can aid further attacks by revealing sensitive file locations (e.g., configuration files, private keys, or other artifacts) present on the host.

References

	URL	Tags
	5a6e4751-2f3f-4070-9419-94fb35b644e8	https://github.com/MISP/MISP/commit/9a2a4acfe

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "modules": [
            "EventReport"
          ],
          "product": "MISP",
          "programFiles": [
            "app/Model/EventReport.php"
          ],
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "versions": [
            {
              "lessThan": "2.5.47",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In MISP, the EventReport::uploadPicture method in processed a caller-supplied tmp_name field by invoking file_exists(), mime_content_type(), and exif_imagetype() on the supplied path before verifying that the value was a genuine PHP upload via is_uploaded_file(). An authenticated user holding the perm_add permission could supply an arbitrary filesystem path as the tmp_name value. The application would then probe that path and return distinct validation error messages depending on whether the file existed, its MIME type, or its image format. By observing the differing error responses, an attacker could enumerate the existence of files at arbitrary paths on the MISP server and determine their type.\u00a0\n\nThis constitutes an information disclosure vulnerability: the server\u0027s filesystem layout and file types are leaked to any user with the perm_add role without requiring administrative access.\u00a0\n\nThe vulnerability does not allow reading file contents, writing files, or executing code, but it can aid further attacks by revealing sensitive file locations (e.g., configuration files, private keys, or other artifacts) present on the host."
    }
  ],
  "id": "CVE-2026-95693",
  "lastModified": "2026-09-22T16:18:23.200",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "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: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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-95693",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
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          "role": "CISA Coordinator",
          "timestamp": "2026-09-22T15:09:40.847048Z",
          "version": "2.0.3"
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  "published": "2026-09-22T15:17:27.443",
  "references": [
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      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "url": "https://github.com/MISP/MISP/commit/9a2a4acfe"
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  "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
  "vulnStatus": "Deferred",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "type": "Secondary"
    }
  ]
}

CVE-2026-95693 (GCVE-0-2026-95693)

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

Title

MISP Information Disclosure via Forged Upload Path

Summary

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 15:09 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-22 - Improper Limitation of a Pathname to a Restricted Directory (Path Traversal)

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/9a2a4acfe	patch

Impacted products

1 product

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

Credits

Jeroen Pinoy iglocska Claude Opus 4.8

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 14:16
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/9a2a4acfe.patch 0a64cbcd6700…
Confidence: medium

Commit	Subject	Patch SHA-256
`9a2a4acfe71e`	fix: [security] Reject a forged upload path in the	`0a64cbcd6700…`

Fix summary

The fix introduces an early validation gate in EventReport::uploadPicture that checks is_uploaded_file() on the supplied tmp_name before any filesystem-probing functions (file_exists, mime_content_type, exif_imagetype) are invoked. If the value is not a genuine PHP upload, the method immediately returns a generic error message, preventing the attacker from using the endpoint as an oracle for filesystem enumeration.

Patch summary

In app/Model/EventReport.php, eight lines are inserted at the top of the upload-processing block (after the size/error check). The added code verifies that $picture['tmp_name'] is non-empty and passes is_uploaded_file(). If either condition fails, a generic 'File was not uploaded correctly' error is appended to $saveResult['errors'] and the function returns early, before pathinfo, file_exists, mime_content_type, or exif_imagetype are ever called on the untrusted path.

CVSS rationale

AV:N: MISP is a web application accessed over the network. AC:L: The attack requires only crafting a request with a different tmp_name value; no race conditions or complex setup are needed. AT:N: No prior user interaction or attack complexity beyond the request is required. PR:L: The attacker needs an authenticated account with the perm_add permission, which is a low-privilege role in MISP (not admin). UI:N: No victim interaction is required. VC:L: File existence and type information is disclosed, but file contents are not readable. VI:N, VA:N: No integrity or availability impact. SC:N, SI:N, SA:N: No impact on subsequent components.

Weakness rationale

CWE-200 The primary security impact is the disclosure of filesystem state (file existence and type) through distinct error messages, which is a classic information exposure weakness. The attacker does not read file contents but learns metadata about arbitrary paths.
CWE-22 The caller-supplied tmp_name was used as a filesystem path without restricting it to the upload directory. Although the impact here is information disclosure rather than full file read/write, the root cause is the lack of path restriction, making CWE-22 a contributing weakness.

Attack pattern rationale

CAPEC-177 The attacker manipulates the tmp_name parameter to reference file paths outside the intended upload directory, causing the server to probe arbitrary locations. Although the observable effect is information disclosure rather than full file read, the mechanism is path traversal: the application uses an untrusted path string to access the filesystem. CAPEC-177 is the closest available pattern; the uncertainty is that the impact is limited to metadata disclosure rather than full traversal read, but no more specific CAPEC exists for 'path probing via error-message oracle'.

Assumptions to verify

The affected version boundary is inferred from the tag_version_boundary metadata (v2.5.47, 49 commits after fix), suggesting versions prior to the fix commit are vulnerable. No explicit version range is stated in the patch.
PR:L is assumed because the commit message specifies 'any perm_add user', which is a non-admin role in MISP. The exact privilege level mapping to CVSS PR is an assumption.
VC:L is assigned because the disclosure is limited to file existence and type metadata, not full file contents. If the information disclosed is considered more sensitive in a specific deployment, VC could be rated higher.
CAPEC-177 (Path Traversal) is the closest available pattern; the actual impact is an information-disclosure oracle rather than a full traversal read, so the mapping is approximate.
The Co-Authored-By line credits an AI assistant (Claude Opus 4.8) as a remediation developer. This is recorded as supplied in the metadata but is atypical for CVE credit.

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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                    "sourceUrl": "https://github.com/MISP/MISP/commit/9a2a4acfe.patch",
                    "subject": "fix: [security] Reject a forged upload path in the"
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                ]
              }
            }
          },
          "recordType": "advisory",
          "vulnId": "GCVE-1-2026-20218"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
    "assignerShortName": "CIRCL",
    "cveId": "CVE-2026-95693",
    "datePublished": "2026-09-22T14:22:28.896Z",
    "dateReserved": "2026-09-22T14:22:26.180Z",
    "dateUpdated": "2026-09-22T15:09:48.685Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

FKIE_CVE-2026-95693

CVE-2026-95693 (GCVE-0-2026-95693)

Fix summary

Patch summary

CVSS rationale

Weakness rationale

Attack pattern rationale

Assumptions to verify

Model comparison

Tags

Sightings

Nomenclature

Related by attack behaviour