oss-bucket-exploit

A guide to assessing misconfigured cloud object-storage buckets, including AWS S3, Alibaba OSS, Tencent COS, and Huawei OBS. These services store files and other objects in remotely accessible buckets.

In plain words
What is it for?
Use it to enumerate buckets and objects, check ACLs and policies, test public access, assess takeover risks, traverse objects, and review arbitrary upload paths.
Why use it?
It helps detect storage that is publicly readable or writable, controlled by weak policies, or exposed through unsafe upload and access settings.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/wgpsec/aboutsecurity/oss-bucket-exploit
Any agent
npx skills add wgpsec/AboutSecurity --skill oss-bucket-exploit
Clone the repo
git clone --depth 1 https://github.com/wgpsec/AboutSecurity

Made for: Claude Code, Codex.

Per session 180 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,379 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00180 $0.03379
Opus 5 $0.00090 $0.01690
Sonnet 5 $0.00036 $0.00676
Haiku 4.5 $0.00018 $0.00338

Measured 3d ago against content hash b516652f2894, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

oss-bucket-exploit scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -sI https://TARGET_URL | grep -iE 'x-amz|x-oss|x-cos|x-obs|AmazonS3|aliyuncs|myqcloud|tencent-cos'
skills/cloud/oss-bucket-exploit/SKILL.md · 346 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 346 lines · 180 tokens per session scan A b516652f2894

Subscribe to this mod's changes

oss-bucket-exploit is a skill published in the GitHub repository wgpsec/AboutSecurity (1,709 stars, last pushed 3d ago), with no licence file. It adds 180 tokens to every session and 3,379 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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