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False positive in XML: partial substring match inside larger identifier #734

@quasarea

Description

@quasarea

Summary

DevSkim appears to report a false positive when a rule-relevant token is only present as a partial substring inside a larger XML identifier.

In our case, the finding is triggered by DES_ANNO_SHA appearing inside the XML attribute value SCPDES_ANNO_SHAPE_1.

That match does not look semantically valid. It is part of a larger symbolic identifier, not an actual standalone secret or security-relevant token.

Example

XML snippet:

<Setting name="Label shape   1" keyWord="SCPDES_ANNO_SHAPE_1" type="string" value="" description="Name of shape representing label for automatic annotation. If not set, default shape from 'General options'->'Annotation settings'->'Default shapes' will be taken." />

The issue appears to be that DES_ANNO_SHA is detected inside SCPDES_ANNO_SHAPE_1.

Why this looks incorrect

The reported text is:

  • only a partial substring
  • embedded inside a larger XML keyword/identifier
  • not a standalone token
  • not meaningful on its own in this context

Matching partial words like this creates noise and makes the result hard to act on.

Expected behavior

DevSkim should avoid reporting this kind of partial-word match in XML attribute values unless the rule explicitly intends substring matching with clear token boundaries.

Environment

  • DevSkim CLI used in Azure DevOps pipeline
  • File type: XML

Request

Please confirm whether this is an expected rule behavior. If not, this looks like a false positive and the rule should likely enforce stronger token boundaries or identifier-aware matching.

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