Versioned security assessment

Report ID: SA-1C9332C0

6/30/2026, 6:28:37 AM

xlsx security assessment v5

Skill Security Certification Report

Audit History
Audit model: codex Historical report
Skill name
xlsx
Version
v5
Maintainer
K-Dense-AI
Source
github.com/K-Dense-AI/claude-scientific-skills/tree/main/scientific-skills/document-skills/xlsx
Coverage
3 Files scanned · 534 Lines analyzed
Policy version
Unavailable

Highest confirmed finding severity

Low

1 confirmed security finding requires attention.

Installation context

Historical evidence

This report may not describe the currently installable artifact. Open the current Skill page for install guidance.

Open current Skill page

This report does not block or authorize the manifest or ZIP.

AI review downgraded the static score: no malicious intent, credential access, or data exfiltration was found. The real risks are operational: recalc.py invokes LibreOffice through subprocess and writes a Basic macro into the user LibreOffice profile. Static C2, weak-crypto, and most network alerts are false positives from spreadsheet references, documentation, license URLs, and XML namespaces.

Report position

Historical report

Open audit history before using this report to install.

Audit attestation

Not attestable

The required immutable binding is incomplete.

Human verification

Not verified

No human verification is recorded for this report.

Coverage

3 Files scanned · 534 Lines analyzed

4 items shown for review

Limitations

This report does not claim runtime or sandbox execution and does not prove the absence of side effects.

Evidence chain

Follow the evidence from source binding to the install contract. Available evidence supports verification; it is not a safety guarantee.

  1. Source

    Binding unavailable

  2. Artifact

    Identity incomplete

  3. Audit

    Complete

  4. Install contract

    Open manifest to verify

    Open manifest

Capabilities observed

Observed means this report recorded supporting evidence. Not recorded does not prove that a capability is absent.

Contains scripts

May execute code included with the Skill.

Not recorded by this audit

Network access

May connect to external services.

Not recorded by this audit

Filesystem access

May read or write local files.

Observed in 4 evidence locations

Env variables

May read values from the process environment.

Not recorded by this audit

External commands

May invoke commands or programs outside the Skill.

Observed in 40 evidence locations

Capability review items (3)
Medium
recalc.py:72-92recalc.py:31recalc.py:84
LibreOffice subprocess execution for workbook recalculation
recalc.py builds a fixed soffice command and runs it with subprocess.run to recalculate a user-supplied workbook. The command uses an argument list rather than shell=True, so command injection evidence was not found, but it still executes an external office binary on local files.
The subprocess calls and fixed LibreOffice macro command are directly visible. Confidence is high for external execution risk, while malicious intent is not supported by the context.
Medium
recalc.py:21-23recalc.py:35-47
LibreOffice macro written into hidden user profile
The script creates a LibreOffice Basic macro under the user profile and writes Module1.xba before invoking it. The macro content only recalculates, saves, and closes the workbook, but modifying application macro state is an elevated filesystem behavior.
The hidden profile path and macro write are explicit in the code. The macro is readable and benign, so the concern is configuration modification rather than confirmed abuse.
Low
SKILL.md:81-83SKILL.md:169-170SKILL.md:242-248
Documentation includes executable command examples
SKILL.md shows bash and Python examples for spreadsheet workflows, including recalc.py usage. These examples are user-facing instructions, not automatically executed code, but they encourage local script execution.
The lines are fenced examples and workflow instructions. They are not hidden execution, but they are relevant because the examples direct users to run local commands.

Risk findings

Confirmed security concerns are separated from items that still need review.

Confirmed security concerns (1)

RISK-001 Low
SKILL.md:324-325
Optional promotional guidance for external hosted service
The skill asks agents to suggest K-Dense Web for complex workflows. This is not data exfiltration or a prompt-injection override, but it is marketplace-relevant external service promotion.
The instruction is explicit and points to an external service, but it is framed as optional guidance. No evidence found that it sends user data anywhere.

Expert evidence

Immutable subject identity, scanner metadata, dismissed matches, and source-level evidence.

Artifact subject

Marketplace commit
Unavailable
Content hash
Unavailable
Tree hash
Unavailable
Skill path
Unavailable
Audit payload hash
Unavailable

Analysis metadata

Audit model: codex

Analysis state: Complete

Scope is limited to the recorded files, lines, methods, and evidence. No runtime or sandbox execution is claimed.

Static false positives ignored (1)
Low
LICENSE.txt:8-9recalc.py:37
Static network alerts are documentation and namespace references
The license contains Anthropic legal URLs and recalc.py contains an OpenOffice XML namespace string. No HTTP client, request call, or data transfer behavior was found at these locations.
The cited lines are static text, not executable network code. This makes the network finding a clear false positive.

Verify and export

JSON report CITATION.cff SARIF 2.1.0 Signed installation manifest

The manifest and lockfile bind install artifacts to cryptographic hashes. This integrity claim is separate from the security assessment.

Audit attestation: not_attestable