xxe
Hunt XML External Entity flaws in parsers and validate file read / SSRF impact with strict negative controls.
Source facts
- Repository
- BitterSecurity/Decepticon
- Last source activity
- June 2, 2026 at 17:42
- Detected SKILL.md language
- English
- Stars
- 5,611
- Forks
- 1,061
Install options
The review-first prompt is selected by default. You can switch to a direct command or download a local copy.
Review the source files
Read SKILL.md and any companion files shown by SkillsMP before deciding whether to install.
Showing SKILL.md
SKILL.md
Source instructions · Read-only preview- name
- xxe
- description
- Hunt XML External Entity flaws in parsers and validate file read / SSRF impact with strict negative controls.
- metadata
- {"subdomain":"web-exploitation","when_to_use":"xxe xml external entity parser file read ssrf cwe-611 dtd parameter entity blind oob"}
# XXE Playbook
## Find parser sinks
- Java: `DocumentBuilderFactory`, `SAXParserFactory`, `XMLInputFactory`
- Python: `lxml.etree`, `xml.dom.minidom`, `xml.sax`
- .NET: `XmlDocument`, `XDocument`, `XmlReader`
## Dangerous defaults
- DTD enabled
- External entities enabled
- Network/file entity resolution enabled
## Payloads
- File read: entity to `file:///etc/passwd`
- SSRF: entity to internal URL (metadata service, localhost admin)
## Validation
- Positive: parser output contains file content or internal response markers.
- Negative: same XML without entity expansion must not leak content.
View on GitHub