CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory

Source-backed guidance

Additional facts reviewed against primary or authoritative security sources.

Verify controls for CWE-538 with SSDF evidence

Use NIST SSDF verification and vulnerability-response practices to detect CWE-538, Insertion of Sensitive Information into Externally-Accessible File or Directory, throughout the product lifecycle. Derive review questions, static or dynamic checks, and negative tests from the CWE's causal behavior; define the components and lifecycle stages each check covers; and retain findings with enough evidence to distinguish the root cause from symptoms and impacts. Track escapes and false negatives, then improve the verification plan after every confirmed occurrence.

NIST SP 800-218 Secure Software Development Framework — National Institute of Standards and Technology

Address Insertion of Sensitive Information into Externally-Accessible File or Directory during Architecture and Design

MITRE associates mitigation with Architecture and Design, Operation, and System Configuration; documented detection approaches include Automated Static Analysis; recorded impacts include Read Files or Directories. Use these source-defined anchors to turn CWE-538 into implementation, review, and verification checks for the affected component.

CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory — MITRE CWE

Triage CWE-538 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-538, Insertion of Sensitive Information into Externally-Accessible File or Directory, has evidence of exploitation in the wild. Confirm the CVE-to-CWE root-cause mapping independently before attaching the example, then capture the affected product, required action, and remediation deadline. A missing KEV match is not evidence that the weakness is unexploited, and a KEV entry must not be generalized to every occurrence of this CWE.

Known Exploited Vulnerabilities Catalog — Cybersecurity and Infrastructure Security Agency

Apply precise root-cause mapping to CWE-538

Apply MITRE's full root-cause mapping guidance when using CWE-538, Insertion of Sensitive Information into Externally-Accessible File or Directory. Separate weakness language from attacker prerequisites and technical impact, check the entry's abstraction and vulnerability-mapping notes, and prefer the most specific Base or Variant supported by the evidence. Record the rejected alternatives and require an independent review before the mapping is used for remediation trends or program metrics.

CVE to CWE Root Cause Mapping Guidance — MITRE CWE

Validate CWE-538 with root-cause mapping checks

Apply MITRE's root-cause mapping quick tips to CWE-538, Insertion of Sensitive Information into Externally-Accessible File or Directory. Confirm the finding describes the causal weakness rather than an impact or attack pattern, compare the abstraction and mapping notes with plausible alternatives, and have a second reviewer challenge the selection. Preserve the evidence and reasoning so recurring defects can be measured against one consistent identifier.

CVE to CWE Root Cause Mapping Quick Tips — MITRE CWE

Frequently Asked Questions

What is CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory?+

CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product places sensitive information into files or directories that are accessible to actors who are allowed to have access to the files, but not to the sensitive information.

What are the security consequences of Insertion of Sensitive Information into Externally-Accessible File or Directory?+

If exploited, CWE-538 (Insertion of Sensitive Information into Externally-Accessible File or Directory) it can compromise Confidentiality, leading to outcomes such as Read Files or Directories.

How do you prevent or mitigate Insertion of Sensitive Information into Externally-Accessible File or Directory?+

Recommended mitigations for CWE-538 include: Do not expose file and directory information to the user.

Which programming languages are affected by Insertion of Sensitive Information into Externally-Accessible File or Directory?+

CWE-538 commonly affects Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.

What are real-world examples of Insertion of Sensitive Information into Externally-Accessible File or Directory?+

MITRE documents real CVEs mapped to CWE-538, including CVE-2018-1999036. You can look up the full details of each CVE, including CVSS scores and remediation guidance, on our CVE Lookup tool.

What is the difference between a CWE and a CVE?+

A CWE (Common Weakness Enumeration) like CWE-538 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.

CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory

Technical Details

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Code Examples & CVEs

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Observed CVE Examples (1)

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