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web-open-graph-ssrf

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SSRF through link-preview / URL-unfurl / oEmbed features. Load when the app generates a preview card for a user-supplied URL: chat/forum/comment link unfurling, "add a link" in posts or profiles, oEmbed endpoints, rich-text editors that auto-embed, bookmark/save-for-later tools, or any UI that shows an Open Graph title/image/description for a pasted link. Signals: params like url=, link=, embed=, preview=; a "fetching preview" spinner; response JSON with og:title / og:image fields; User-Agents like *bot, *crawler, Slackbot, Discordbot, or a fetch from a different egress IP than the app.

skills/web/web-open-graph-ssrf/SKILL.md

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Observed behavior
Network or broad shell
Last checked
Nov 11, 2026

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27
Repository last updated
Oct 14, 2026
License
MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

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# Open Graph / link-preview SSRF

## When it applies
The app unfurls user-supplied URLs — chat messages, comments, profile links, oEmbed consumers,
"import bookmark", RSS/save-for-later. The dedicated fetch this triggers is an SSRF primitive,
often with **weaker filtering than the main app** because previews must work for arbitrary
third-party sites. Also applies when the preview is rendered by a headless browser (adds
XSS-in-preview and local-file angles).

## Why it works
Unfurlers are built to fetch *anything*, so allowlists are rare or trivially bypassed. The fetch
frequently runs in a **separate worker/microservice** with its own network position — internal
dashboards, metadata IPs, and queues may be reachable from there even when the web tier is
locked down. The fetcher also *parses* the response (HTML, images, sometimes JS), which adds
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