sast-xxe

sast-xxe is a skill for Claude Code, Codex from capture0x/YeepForge. It costs 100 tokens per session (7,125 once invoked), scanned A, original, no licence file.

A security check for XML External Entity (XXE) vulnerabilities, which can occur when XML parsers process unsafe external references. It searches XML parsing code, traces user input, and combines the findings.

In plain words
What is it for?
Reviewing a codebase for XXE risks and identifying XML parsing locations that lack protection against external entities.
Why use it?
It helps find XML handling that may allow attackers to read files or access other resources through crafted XML. It also organizes checks across multiple parsing sites.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Reviewing a codebase for XXE risks and identifying XML parsing locations that lack protection against external entities.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/capture0x/yeepforge/sast-xxe
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add capture0x/YeepForge --skill sast-xxe
Clone the repo
git clone --depth 1 https://github.com/capture0x/YeepForge

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for sast-xxe

README.md
[![agentmods](https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-xxe/github.svg)](https://agentmods.dev/skills/capture0x/yeepforge/sast-xxe)
Your own site
<a href="https://agentmods.dev/skills/capture0x/yeepforge/sast-xxe"><img src="https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-xxe/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for sast-xxe

Your own site · 80×15
<a href="https://agentmods.dev/skills/capture0x/yeepforge/sast-xxe"><img src="https://agentmods.dev/badge/skills/capture0x/yeepforge/sast-xxe.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,125 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00100 $0.07125
Opus 5.5 $0.00040 $0.02850
Sonnet 5.5 $0.00020 $0.01425
Haiku 4.5 $0.00010 $0.00713

Measured 2mo ago against content hash b268a705635f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sast-xxe scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

> [curl command or payload to confirm the finding.
modules/sast_skills/sast-xxe/SKILL.md · 569 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 569 lines · 100 tokens per session scan A b268a705635f

Subscribe to this mod's changes

sast-xxe is a skill published in the GitHub repository capture0x/YeepForge (8 stars, last pushed 2mo ago), with no licence file. It adds 100 tokens to every session and 7,125 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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