csp-bypass SKILL.md skillF
csp-bypass from dreadnode/capabilities is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dreadnode/capabilities/csp-bypass@git:20260923.1ccb5b1Pins git:20260923.1ccb5b1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- F, 15 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dreadnode/capabilities
- Path
capabilities/web-security/skills/csp-bypass/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260923.1ccb5b1, committed Sep 23, 2026
- First version recorded
- May 4, 2026
- Size
- 10,509 bytes
- Repository stars
- 22
- License
- MIT
Bypass Content-Security-Policy to achieve XSS when CSP blocks inline scripts. Covers JSONP gadgets, framework abuse (Angular/HTMX/Alpine), missing directive exploitation, and nonce/hash weaknesses. Use when you have HTML injection but CSP prevents script execution.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# CSP Bypass
## When to Use
- You have HTML injection (reflected or stored) but CSP blocks inline `<script>` execution
- Target has a CSP header and you need to evaluate it for weaknesses
- You found XSS in a CSP-protected application and need to escalate to full JS execution
## Triage: Parse the CSP First
Extract the CSP header and evaluate systematically:
```bash
curl -sI https://target.com | grep -i content-security-policy
```
Check for fatal weaknesses before attempting bypasses:
1. **`unsafe-inline` without nonce/hash** = inline `<script>alert(1)</script>` works directly
2. **`unsafe-eval`** = `eval()`, `setTimeout('string')`, `new Function('string')` all work
3. **`data:` in script-src** = `<script src="data:text/javascript,alert(1)"></script>`
4. **`blob:` in script-src** = construct and execute blob URLs
5. **Missing `script-src` AND `default-src`** = no script restrictions at all
6. **`Report-Only` mode** = CSP is not enforced, only logged. Full XSS works.
7. **`strict-dynamic`** = nonce-created scripts can load additional scripts (bypass whitelist)
8. **`*` wildcard** = any domain allowed, load attacker-hosted JS
## Bypass Techniques
…Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/csp-bypass@sha256:9b89949a3391b339The line at the top of this page pins the label git:20260923.1ccb5b1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_gwessdnybzkvwris)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between May 4, 2026 and Sep 23, 2026, about one every 142 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260923.1ccb5b1 latest | 2026-09-23 | 1ccb5b1 | 10,509 B | F | view · diff |
| git:20260504.2a64374 | 2026-05-04 | 2a64374 | 10,715 B | F | view |
Audit of the latest version
- FAIL, critical: No text hidden with inline styles (matched: style="opacity:0)
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10509 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
dreadnode/capabilities · 22 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_gwessdnybzkvwris GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/csp-bypass GET https://markdownregistry.com/api/v1/blob/9b89949a3391b339cba300bec4155f2d17644aa7ccb67cff3bc74eb33240edc6
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.