ssti
Untrusted input rendered as a template, allowing template-engine expression execution.
Skill by jaiswalakshansh
Chalk Labs
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Install
Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.
npx agentmarket install skill/jaiswalakshansh-ssti
Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.
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About
Reviews
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Permissions
What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.
- Tools
- No tools found
- Secrets
- None asked for
- Install scripts
- None found
Network hosts it talks to 1
codeload.github.com· found in install command
Files it touches
~/.claude/skills/ssti
What's inside
- Skill name
ssti- Description
- Untrusted input rendered as a template, allowing template-engine expression execution.
- License
- MIT
- Instructions
- 18 lines in SKILL.md · view on GitHub
Files (1)
- SKILL.md
SKILL.md (first lines)
# Server-Side Template Injection (SSTI)
## Recon
Find template sinks whose *template string* is built from input:
`render_template_string`, `Template(...).render`, `Environment.from_string`,
Jinja/Twig/Freemarker string rendering. Distinguish from passing input as template
*data* (safe) vs as the template *source* (dangerous).
## Verify (false-positive reduction)
1. Is attacker input the template source, or just a variable rendered inside a
fixed template? Only the former is SSTI.
2. Is a sandboxed environment used?
## Evidence
Source→sink path and the render call. Payload sketch: `{{7*7}}` → `49` confirms
evaluation.From jaiswalakshansh/crucible, MIT.
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- 0.471score
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auth-bypass
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Authentication that can be skipped, forged, or is missing on a protected action.
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command-injection
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Untrusted input reaching an OS command execution sink without safe argument handling.
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insecure-deserialization
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Untrusted data deserialized by an unsafe deserializer, enabling object injection / RCE.
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insecure-llm-output
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LLM/model output flowing into a dangerous sink (code/command/SQL/HTML) without validation.
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csrf
jaiswalakshansh
A state-changing endpoint that lacks anti-CSRF protection.
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dom-xss
jaiswalakshansh
Untrusted browser input reaching a DOM HTML sink without escaping.
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path-traversal
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Untrusted input used to build a filesystem path, allowing access outside the intended directory.
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xxe
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Untrusted XML parsed with external entities enabled, allowing file read / SSRF.
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Signals
- Stars
- 0
- Forks
- 0
- Open issues
- 0
- Last commit (this folder)
- Jul 23, 2026 (3 months ago)
From GitHub (fetched Oct 24, 2026).
Details
- License
- MIT
- Repository
- github.com/jaiswalakshansh/crucible
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
- Source
- GitHubgithub-graphql
More from jaiswalakshansh
- 0.471score
sql-injection
jaiswalakshansh
Detect SQL injection: untrusted input reaching a database query without parameterization or safe escaping.
SkillCFreshness: CClaude Code +9 - 0.469score
command-injection
jaiswalakshansh
Untrusted input reaching an OS command execution sink without safe argument handling.
SkillCFreshness: CClaude Code +9 - 0.469score
broken-access-control
jaiswalakshansh
A resource or action reachable without an ownership/authorization check (IDOR, missing authz).
SkillCFreshness: CClaude Code +9 - 0.469score
business-logic
jaiswalakshansh
A flaw in application logic (not a generic injection) that lets an attacker abuse intended functionality.
SkillCFreshness: CClaude Code +9 - 0.469score
ssrf
jaiswalakshansh
Untrusted input controlling the destination of a server-side HTTP request.
SkillCFreshness: CClaude Code +9 - 0.469score
insecure-deserialization
jaiswalakshansh
Untrusted data deserialized by an unsafe deserializer, enabling object injection / RCE.
SkillCFreshness: CClaude Code +9
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Cite this page
ssti skill. Agent Mart. https://agentmart.dev/skills/jaiswalakshansh-ssti (last updated 2026-10-24)