Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.
CWE-546 Variant Draft
Suspicious Comment
This weakness occurs when code contains comments that flag potential issues, such as bugs, security gaps, or unfinished work, which can expose underlying problems or oversights.
Definition
What is CWE-546?
This weakness occurs when code contains comments that flag potential issues, such as bugs, security gaps, or unfinished work, which can expose underlying problems or oversights.
Comments like BUG, HACK, FIXME, TODO, or LITERAL are more than just notes; they act as red flags for developers and security reviewers. They often point directly to areas where security controls, input validation, or proper error handling are missing or incomplete, leaving the code vulnerable. While these comments are sometimes used during development, they become a risk if left in production code, as they can guide attackers to weak spots.
Beyond security, these markers can indicate broader code quality issues, such as hard-coded credentials, performance bottlenecks, or the use of insecure methods like dynamic SQL instead of prepared statements. For a developer, systematically reviewing and addressing these comments is a critical step in hardening an application before release, as they serve as an internal map of potential weaknesses that need resolution.
Real-world impact
Real-world CVEs caused by CWE-546
No public CVE references are linked to this CWE in MITRE's catalog yet.
How attackers exploit it
Step-by-step attacker path
- 1
Identify a code path that handles untrusted input without validation.
- 2
Craft a payload that exercises the unsafe behavior — injection, traversal, overflow, or logic abuse.
- 3
Deliver the payload through a normal request and observe the application's reaction.
- 4
Iterate until the response leaks data, executes attacker code, or escalates privileges.
Vulnerable code example
Vulnerable Java
The following excerpt demonstrates the use of a suspicious comment in an incomplete code block that may have security repercussions.
if (user == null) {
```
// TODO: Handle null user condition.*
} Secure code example
Secure pseudo
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
const safe = validateAndEscape(input);
return executeWithGuards(safe);
} What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Prevention checklist
How to prevent CWE-546
- Documentation Remove comments that suggest the presence of bugs, incomplete functionality, or weaknesses, before deploying the application.
Detection signals
How to detect CWE-546
Run dynamic application security testing against the live endpoint.
Watch runtime logs for unusual exception traces, malformed input, or authorization bypass attempts.
Code review: flag any new code that handles input from this surface without using the validated framework helpers.
CWE-546
Don't catalog this weakness. Prove it's reachable.
Plexicus turns CWE catalogs into evidence: every CWE-pattern is matched against your real code graph, reach is proven on a sandbox clone, and verified findings ship as reviewed PRs.
Frequently asked questions What is CWE-546?
How serious is CWE-546?
What languages or platforms are affected by CWE-546?
How can I prevent CWE-546?
How does Plexicus detect and fix CWE-546?
Where can I learn more about CWE-546?
Frequently asked questions
What is CWE-546?
This weakness occurs when code contains comments that flag potential issues, such as bugs, security gaps, or unfinished work, which can expose underlying problems or oversights.
How serious is CWE-546?
MITRE has not published a likelihood-of-exploit rating for this weakness. Treat it as medium-impact until your threat model proves otherwise.
What languages or platforms are affected by CWE-546?
MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.
How can I prevent CWE-546?
Remove comments that suggest the presence of bugs, incomplete functionality, or weaknesses, before deploying the application.
How does Plexicus detect and fix CWE-546?
Plexicus's SAST engine matches the data-flow signature for CWE-546 on every commit. When a match is found, our Codex Remedium agent opens a fix PR with the corrected code, tests, and a one-line summary for the reviewer.
Where can I learn more about CWE-546?
MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/546.html. You can also reference OWASP and NIST documentation for adjacent guidance.
Related weaknesses
Weaknesses related to CWE-546
CWE-1078 Parent
Inappropriate Source Code Style or Formatting
This weakness occurs when source code violates established style guidelines for formatting, indentation, whitespace, or commenting, making…
CWE-1085 Sibling
Invokable Control Element with Excessive Volume of Commented-out Code
This weakness occurs when a callable function, method, or procedure contains a large amount of inactive, commented-out code within its…
CWE-1099 Sibling
Inconsistent Naming Conventions for Identifiers
This weakness occurs when a codebase uses mixed naming styles for elements like variables, functions, data types, or files, creating an…
CWE-1106 Sibling
Insufficient Use of Symbolic Constants
This weakness occurs when developers embed raw numbers or text strings directly in code instead of using named symbolic constants, making…
CWE-1107 Sibling
Insufficient Isolation of Symbolic Constant Definitions
This weakness occurs when a codebase uses symbolic constants (like named values for numbers or strings) but scatters their definitions…
CWE-1109 Sibling
Use of Same Variable for Multiple Purposes
This weakness occurs when a single variable is reused to handle multiple, unrelated tasks or to store different pieces of data throughout…
CWE-1113 Sibling
Inappropriate Comment Style
This weakness occurs when source code comments are written in a style or format that doesn't match the project's established standards or…
CWE-1114 Sibling
Inappropriate Whitespace Style
This weakness occurs when source code uses inconsistent or non-standard whitespace formatting, such as irregular indentation, spacing, or…
CWE-1115 Sibling
Source Code Element without Standard Prologue
This weakness occurs when source code files or modules lack a consistent, standardized header or prologue that the development team has…
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