codeguard-0-client-side-web-security Cursor ruleB
codeguard-0-client-side-web-security from santosomar/ai-agents-for-cybersecurity is a Cursor rule: instructions the Cursor agent follows in that repo.
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-client-side-web-security.mdc@v1.5.0Pins v1.5.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 13 of 14 checks passed
- Kind
- Cursor rule
- Repository
- santosomar/ai-agents-for-cybersecurity
- Path
.cursor/rules/codeguard-0-client-side-web-security.mdc- Versions recorded
- 2
- Latest version
- v1.5.0, committed Oct 12, 2026
- First version recorded
- Oct 19, 2025
- Size
- 5,718 bytes
- Repository stars
- 251
- License
- BSD-3-Clause
Client-side web security (XSS/DOM XSS, CSP, CSRF, clickjacking, XS-Leaks, third-party JS).
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
rule_id: codeguard-0-client-side-web-security
## Client‑side Web Security
Protect browser clients against code injection, request forgery, UI redress, cross‑site leaks, and unsafe third‑party scripts with layered, context‑aware controls.
### XSS Prevention (Context‑Aware)
- HTML context: prefer `textContent`. If HTML is required, sanitize with a vetted library (e.g., DOMPurify) and strict allow‑lists.
- Attribute context: always quote attributes and encode values.
- JavaScript context: do not build JS from untrusted strings; avoid inline event handlers; use `addEventListener`.
- URL context: validate protocol/domain and encode; block `javascript:` and data URLs where inappropriate.
- Redirects/forwards: never use user input directly for destinations; use server-side mapping (ID→URL) or validate against trusted domain allowlists.
- CSS context: allow‑list values; never inject raw style text from users.
Example sanitization:
```javascript
const clean = DOMPurify.sanitize(userHtml, {
ALLOWED_TAGS: ['b','i','p','a','ul','li'],
ALLOWED_ATTR: ['href','target','rel'],
ALLOW_DATA_ATTR: false
});
```
### DOM‑based XSS and Dangerous Sinks
…Read the whole file at its exact version.
How to install
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-client-side-web-security.mdc@sha256:fb93599380401911The line at the top of this page pins the label v1.5.0, 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_mrt5dwprgeb7hhaf)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 19, 2025 and Oct 12, 2026, about one every 358 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.5.0 latest | 2026-10-12 | 227a2b6 | 5,718 B | B | view · diff |
| v1.0.0 | 2025-10-19 | 52abd04 | 5,729 B | B | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Size between 200 bytes and 200 KB (5718 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 text hidden with inline styles
- 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 the Cursor rule starter on mdpantry, which passes every one of these checks and says what to change in it.
Source
santosomar/ai-agents-for-cybersecurity · 251 stars · license BSD-3-Clause · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_mrt5dwprgeb7hhaf GET https://markdownregistry.com/api/v1/resolve?ref=santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-client-side-web-security.mdc GET https://markdownregistry.com/api/v1/blob/fb935993804019110517b4cde17a8045a688b0c3ed159302b845d51c4516abd2
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: Cursor rules vs AGENTS.md · which agent file does what.