cors-credential-wordpress

cors-credential-wordpress is a skill for Claude Code, Codex from uphiago/recon-skills. It costs 17 tokens per session (1,835 once invoked), scanned A, original, MIT.

A security-testing procedure for checking whether a WordPress site lets another website read private API responses using the victim’s login cookies.

In plain words
What is it for?
Testing WordPress REST API endpoints for credentialed cross-site access and confirming whether the exposure is exploitable on an authorized target.
Why use it?
It helps determine whether a CORS configuration exposes user or site data across websites.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

Good fit Testing WordPress REST API endpoints for credentialed cross-site access and confirming whether the exposure is exploitable on an authorized target.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/uphiago/recon-skills/cors-credential-wordpress
About the project

Recon Skills is a pack of security-testing skills covering reconnaissance, web applications, APIs, authentication, vulnerability validation, cloud infrastructure, and reporting. Security professionals use it for authorized assessments of systems they own or have written permission to test. The catalogue entries are individual skills from the pack.

uphiago/recon-skills · 1,247 stars · on GitHub · hiago.sh

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 uphiago/recon-skills --skill cors-credential-wordpress
Clone the repo
git clone --depth 1 https://github.com/uphiago/recon-skills

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 cors-credential-wordpress

README.md
[![agentmods](https://agentmods.dev/badge/skills/uphiago/recon-skills/cors-credential-wordpress/github.svg)](https://agentmods.dev/skills/uphiago/recon-skills/cors-credential-wordpress)
Your own site
<a href="https://agentmods.dev/skills/uphiago/recon-skills/cors-credential-wordpress"><img src="https://agentmods.dev/badge/skills/uphiago/recon-skills/cors-credential-wordpress/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 cors-credential-wordpress

Your own site · 80×15
<a href="https://agentmods.dev/skills/uphiago/recon-skills/cors-credential-wordpress"><img src="https://agentmods.dev/badge/skills/uphiago/recon-skills/cors-credential-wordpress.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,835 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 3 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Supply Chain · line 128
    Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.
    Fix: Avoid downloading and executing remote scripts. Use trusted packages from PyPI/npm. If remote fetch is required, verify checksums and use HTTPS.
  • high Supply Chain · line 132
    Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.
    Fix: Avoid downloading and executing remote scripts. Use trusted packages from PyPI/npm. If remote fetch is required, verify checksums and use HTTPS.
  • high Supply Chain · line 141
    Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.
    Fix: Avoid downloading and executing remote scripts. Use trusted packages from PyPI/npm. If remote fetch is required, verify checksums and use HTTPS.
How audits are shown
Origin original 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 $0.00017 $0.01835
Opus 5 $0.00009 $0.00918
Sonnet 5 $0.00003 $0.00367
Haiku 4.5 $0.00002 $0.00184

Measured 9d ago against content hash 3661c02bac04, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

cors-credential-wordpress 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 9d 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.

compatibility: Requires curl, nmap, python3, masscan, subfinder, httpx, nuclei
recon/cors-credential-wordpress/SKILL.md · 171 lines

How it starts

The opening of the file, as written. The whole thing — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CORS Credential WordPress Skill

Detect, confirm, and exploit CORS credential reflection on WordPress REST API endpoints. CORS misconfiguration is one of the most common critical findings in US SMB WordPress sites (~7-8% of all WP targets), enabling cross-origin data exfiltration with victim cookies. Documents 8 CORS variants and full browser PoC construction.

When to Use

  • After wp-mass-recon flags a target with Access-Control-Allow-Credentials: true.
  • Testing any WordPress site's REST API for cross-origin data access.
  • Building attack chains: CORS → user enumeration → spear-phishing → ATO.
  • Validating whether a CORS finding is exploitable (not just present).

Prerequisites

  • curl and python3.
  • web_extract or browser_navigate for browser PoC verification.
  • Target must have WordPress REST API accessible (/wp-json/wp/v2/).

How to Run

# Quick detection
curl --max-time 30 --connect-timeout 10 -skI "https://TARGET/wp-json/wp/v2/users" -H "Origin: https://evil.com" | grep -iE "access-control"

# Full CORS matrix (10 endpoints)
for ep in "users" "posts" "pages" "media" "comments" "categories" "tags" "settings" "plugins" "themes"; do
  echo "=== /wp-json/wp/v2/$ep ==="
  curl --max-time 30 --connect-timeout 10 -skI "https://TARGET/wp-json/wp/v2/$ep" -H "Origin: https://evil.com" | grep -iE "access-control|http/"
  echo ""
done

Quick Reference

Variant Detection Exploitability
Origin reflection + creds Access-Control-Allow-Credentials: true + mirror Origin Critical — full data theft
Null origin Access-Control-Allow-Origin: null High — sandboxed iframes
Wildcard no creds Access-Control-Allow-Origin: * (no creds) Info — public data only
Credentialed preflight OPTIONS returns 200 + ACAC High — if GET without preflight
Auth-only leak CORS only on auth-protected endpoints High — cookie theft
Multi-origin Multiple origins reflected Critical — broader attack surface
Plugin-specific CORS CORS only on plugin namespace Medium — plugin data
Staging-only CORS Production has no CORS, staging does Medium — dependent on staging access

Read the full file on GitHub · 171 lines

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. 9d ago First seen · 171 lines · 17 tokens per session scan A 3661c02bac04

Subscribe to this mod's changes

cors-credential-wordpress is a skill published in the GitHub repository uphiago/recon-skills (1,247 stars, last pushed 8d ago), licensed MIT. It adds 17 tokens to every session and 1,835 once invoked, about $0.0001 per session on Opus 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 2026-08-30.

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