Common Weakness Enumeration

CWE-28

Weakness Allowed

Path Traversal: '..\filedir'

Abstraction: Variant · Status: Incomplete

API response cwe.mitre.org

The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "..\" sequences that can resolve to a location that is outside of that directory.

The '..\' manipulation is the canonical manipulation for operating systems that use "\" as directory separators, such as Windows. However, it is also useful for bypassing path traversal protection schemes that only assume that the "/" separator is valid.

Mapping guidance

This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.

Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

Relationships and members
ChildOf: CWE-23 · View CWE-1000
Modes of introduction
Implementation
Porting
Detection methods

Automated Static Analysis

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Content history
Submission: PLOVER · 2006-07-19 · CWE Draft 3
Modification: Eric Dalci · Cigital · 2008-07-01 · CWE 1.0

updated Potential_Mitigations, Time_of_Introduction

Modification: CWE Content Team · MITRE · 2008-09-08 · CWE 1.0

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2008-10-14 · CWE 1.0.1

updated Applicable_Platforms, Description, Name

Modification: CWE Content Team · MITRE · 2008-11-24 · CWE 1.1

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2009-07-27 · CWE 1.5

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2010-06-21 · CWE 1.9

updated Description, Potential_Mitigations

Modification: CWE Content Team · MITRE · 2011-03-29 · CWE 1.12

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2011-06-01 · CWE 1.13

updated Common_Consequences

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated Observed_Examples, Relationships

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Applicable_Platforms

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Potential_Mitigations, Relationships

Modification: CWE Content Team · MITRE · 2020-06-25 · CWE 4.1

updated Observed_Examples, Potential_Mitigations

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Description

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes

Modification: CWE Content Team · MITRE · 2025-09-09 · CWE 4.18

updated Affected_Resources, Functional_Areas

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Applicable_Platforms, Detection_Factors, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Common_Consequences, Description, Time_of_Introduction

5 vulnerabilities reference this CWE, most recent first.

CVE-2026-90726 (GCVE-0-2026-90726)

Vulnerability from cvelistv5 – Published: 2026-10-27 13:37 – Updated: 2026-10-28 16:16
VLAI
Summary
Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain a Path Traversal vulnerability. A high privileged attacker with local access could potentially exploit this vulnerability, leading to Denial of service.
Severity
6 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-28 14:33 UTC
CWE
  • CWE-28 - Path Traversal: '..\filedir'
Assigner
dell CNA under the mitre root
CNA scorecard C 70/100 over 538 records in the last 180 days details
References
Impacted products
Vendor Product Version
Dell PowerProtect Data Domain Affected: 0 , < 8.9.0.0 or later (semver)
Affected: 0 , < 7.13.1.90 or later (semver)
Affected: 0 , < 8.3.1.50 or late (semver)
Affected: 0 , < 8.6.1.30 or later (semver)
Create a notification for this product.
Date Public
2026-10-01 06:30
Show details on NVD website
To clipboard 

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CVE-2023-2059 (GCVE-0-2023-2059)

Vulnerability from cvelistv5 – Published: 2023-04-14 14:00 – Updated: 2025-02-06 19:04
VLAI
Title
DedeCMS select_templets.php path traversal
Summary
A vulnerability was found in DedeCMS 5.7.87. It has been rated as problematic. Affected by this issue is some unknown functionality of the file uploads/include/dialog/select_templets.php. The manipulation leads to path traversal: '..\filedir'. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-225944.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-06 19:04 UTC
CWE
  • CWE-28 - Path Traversal: '..\filedir'
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3860 records in the last 180 days details
References
URL Tags
https://vuldb.com/?id.225944 vdb-entrytechnical-description
https://vuldb.com/?ctiid.225944 signaturepermissions-required
https://github.com/ATZXC-RedTeam/cve/blob/main/de… exploit
Impacted products
Vendor Product Version
n/a DedeCMS Affected: 5.7.87
Credits
chinatzxc (VulDB User)
Show details on NVD website
To clipboard 

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GHSA-G733-C497-R4HX

Vulnerability from github – Published: 2023-04-14 15:30 – Updated: 2023-04-22 03:30
VLAI
Details

A vulnerability was found in DedeCMS 5.7.87. It has been rated as problematic. Affected by this issue is some unknown functionality of the file uploads/include/dialog/select_templets.php. The manipulation leads to path traversal: '..\filedir'. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-225944.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Show details on source website
To clipboard 

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GHSA-H83H-P79W-Q64J

Vulnerability from github – Published: 2024-05-14 15:32 – Updated: 2026-04-02 21:31
VLAI
Details

A path handling issue was addressed with improved validation. This issue is fixed in iOS 17.5 and iPadOS 17.5, tvOS 17.5, watchOS 10.5, macOS Sonoma 14.5. An app may be able to read sensitive location information.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

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  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-PF87-CRW2-GFRR

Vulnerability from github – Published: 2026-10-27 15:33 – Updated: 2026-10-27 15:33
VLAI
Details

Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain a Path Traversal vulnerability. A high privileged attacker with local access could potentially exploit this vulnerability, leading to Denial of service.

Severity
6.0 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-90726"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-28"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-27T14:17:04Z",
    "severity": "MODERATE"
  },
  "details": "Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain a Path Traversal vulnerability. A high privileged attacker with local access could potentially exploit this vulnerability, leading to Denial of service.",
  "id": "GHSA-pf87-crw2-gfrr",
  "modified": "2026-10-27T15:33:05Z",
  "published": "2026-10-27T15:33:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90726"
    },
    {
      "type": "WEB",
      "url": "https://www.dell.com/support/kbdoc/en-us/000515178/dsa-2026-416-security-update-for-dell-powerprotect-data-domain-multiple-vulnerabilities"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}
Mitigation MIT-5.1
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
  • Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.
Mitigation MIT-20
Implementation

Strategy: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

No CAPEC attack patterns related to this CWE.

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