hunting-php-object-injection-pop-chains SKILL.md skillA
hunting-php-object-injection-pop-chains from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/hunting-php-object-injection-pop-chains@git:20260826.c45369bPins git:20260826.c45369b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/hunting-php-object-injection-pop-chains/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260826.c45369b, committed Aug 26, 2026
- Size
- 9,193 bytes
- Repository stars
- 26
- License
- MIT
Hunt PHP object injection where untrusted input reaches unserialize or a framework unserializer and a reachable class carries a magic method that fires during or after reconstruction. Covers native unserialize on request data, cookies, or cache entries, phar deserialization triggered by filesystem functions on an attacker-controlled path, and property-oriented programming chains through __wakeup, __destruct, __toString, and __call that reach a file write, a command, or an SQL sink. Use when a…
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
# Hunting PHP object injection and POP chains: when a string rebuilds into an attack PHP object injection follows the same shape as Java gadget chains but through a different trigger. When `unserialize` runs on attacker-controlled data, it reconstructs arbitrary objects of any class already loaded, and PHP's magic methods, `__wakeup`, `__destruct`, `__toString`, `__call`, run automatically during or shortly after reconstruction. A property-oriented programming chain stitches these methods across ordinary classes so that reconstruction alone drives a file write, a system command, or a query. The same trigger hides inside `phar://` stream handling: a filesystem function given an attacker-chosen path deserializes the archive's metadata without any explicit `unserialize` call. You find these by locating every deserialization trigger, explicit or implicit, and asking which loaded classes carry a magic method that starts a chain. ## When to use - A PHP application calls `unserialize` on request data, a cookie, a cache entry, or a stored value. - A filesystem function receives an attacker-influenced path that could carry a `phar://` wrapper. …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-php-object-injection-pop-chains@sha256:f45c57ebfe19e228The line at the top of this page pins the label git:20260826.c45369b, 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_gitwqkr6v63zdtwr)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 26, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9193 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
- pass: No script tag
Source
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_gitwqkr6v63zdtwr GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-php-object-injection-pop-chains GET https://markdownregistry.com/api/v1/blob/f45c57ebfe19e2286f6783ecaee3db2766a803a2ae9728352cd72d3626e2316b
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: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.