Vulnerability-Lookup

GHSA-5F86-RHCP-CXM6

Vulnerability from github – Published: 2026-10-02 15:31 – Updated: 2026-10-02 15:31

Details

Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an MDC-based discriminator value flows unsanitized into a nested FileAppender path, letting an attacker who influences that MDC value (e.g. via an HTTP header) create and append log files outside the intended directory.

This issue affects Logback-classic: from 0.9.14 through 1.6.4. This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.

Severity

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/S:P/AU:N/RE:M/U:Green

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{
  "affected": [],
  "aliases": [
    "CVE-2026-104721"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-02T14:17:10Z",
    "severity": "MODERATE"
  },
  "details": "Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an \nMDC-based discriminator value flows unsanitized into a nested \nFileAppender path, letting an attacker who influences that MDC value \n(e.g. via an HTTP header)\n create and append log files outside the intended directory. \n\n\nThis issue affects Logback-classic: from 0.9.14 through 1.6.4.\u00a0 This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.",
  "id": "GHSA-5f86-rhcp-cxm6",
  "modified": "2026-10-02T15:31:25Z",
  "published": "2026-10-02T15:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104721"
    },
    {
      "type": "WEB",
      "url": "https://logback.qos.ch/news.html#1.6.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/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:P/AU:N/R:X/V:X/RE:M/U:Green",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-104721 (GCVE-0-2026-104721)

Vulnerability from cvelistv5 – Published: 2026-10-02 13:21 – Updated: 2026-10-02 13:21

Title

Logback: Incomplete protection against CVE-2026-19880

Summary

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/S:P/AU:N/RE:M/U:Green

CWE

CWE-22

Assigner

NCSC.ch mitre root Scorecard

References

1 reference

URL	Tags
https://logback.qos.ch/news.html#1.6.5

Impacted products

1 product

Vendor	Product	Version
QOS.CH Sarl	Logback-classic	Affected: 0.9.14 , ≤ 1.6.4 (maven) Unaffected: 1.6.5 (maven)

Date Public

2026-08-14 08:09

Credits

François Martin (GitHub: @martinfrancois, https://github.com/martinfrancois)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "modules": [
            "logback-classic"
          ],
          "platforms": [
            "Java"
          ],
          "product": "Logback-classic",
          "vendor": "QOS.CH Sarl",
          "versions": [
            {
              "lessThanOrEqual": "1.6.4",
              "status": "affected",
              "version": "0.9.14",
              "versionType": "maven"
            },
            {
              "status": "unaffected",
              "version": "1.6.5",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Fran\u00e7ois Martin (GitHub: @martinfrancois, https://github.com/martinfrancois)"
        }
      ],
      "datePublic": "2026-08-14T08:09:00.000Z",
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an \nMDC-based discriminator value flows unsanitized into a nested \nFileAppender path, letting an attacker who influences that MDC value \n(e.g. via an HTTP header)\n create and append log files outside the intended directory. \u003cp\u003e\u003cbr\u003eThis issue affects Logback-classic: from 0.9.14 through 1.6.4.\u0026nbsp; This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.\u003cbr\u003e\u003cbr\u003e\u003c/p\u003e"
            }
          ],
          "value": "Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an \nMDC-based discriminator value flows unsanitized into a nested \nFileAppender path, letting an attacker who influences that MDC value \n(e.g. via an HTTP header)\n create and append log files outside the intended directory. \n\n\nThis issue affects Logback-classic: from 0.9.14 through 1.6.4.\u00a0 This vulnerability is similar to CVE-2026-19880 but involves other attack techniques."
        }
      ],
      "exploits": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "No known exploitation\u003cbr\u003e"
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          "value": "No known exploitation"
        }
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      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "path-traversal vulnerability"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NO",
            "Recovery": "NOT_DEFINED",
            "Safety": "PRESENT",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "GREEN",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/S:P/AU:N/RE:M/U:Green",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "MODERATE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-22",
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              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-02T13:21:59.195Z",
        "orgId": "455daabc-a392-441d-aa46-37d35189897c",
        "shortName": "NCSC.ch"
      },
      "references": [
        {
          "url": "https://logback.qos.ch/news.html#1.6.5"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Update to logack version 1.6.5 or later.\u0026nbsp;This vulnerability requires\u0026nbsp;\u003ccode\u003eSiftingAppender\u003c/code\u003e\u0026nbsp;to be active as well as unsanitized data provided by an \nattacker that MDCDiscriminator makes use of.\u0026nbsp;\u003cbr\u003e\u003cbr\u003eSanitizing relevant data provided by the user should fix this vulnerability."
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        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Logback: Incomplete protection against CVE-2026-19880",
      "workarounds": [
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            }
          ],
          "value": "Update to logack version 1.6.5 or later.\u00a0This vulnerability requires\u00a0SiftingAppender\u00a0to be active as well as unsanitized data provided by an attacker that\u00a0MDCDiscriminator\u00a0makes use of."
        }
      ],
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c",
    "assignerShortName": "NCSC.ch",
    "cveId": "CVE-2026-104721",
    "datePublished": "2026-10-02T13:21:59.195Z",
    "dateReserved": "2026-10-02T11:43:59.014Z",
    "dateUpdated": "2026-10-02T13:21:59.195Z",
    "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.

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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.

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GHSA-5F86-RHCP-CXM6

CVE-2026-104721 (GCVE-0-2026-104721)

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