A small tool to view real-world ActivityPub objects as JSON! Enter a URL
or username from Mastodon or a similar service below, and we'll send a
request with
the right
Accept
header
to the server to view the underlying object.
{
"@context": [
"https://www.w3.org/ns/activitystreams",
{
"ostatus": "http://ostatus.org#",
"atomUri": "ostatus:atomUri",
"inReplyToAtomUri": "ostatus:inReplyToAtomUri",
"conversation": "ostatus:conversation",
"sensitive": "as:sensitive",
"toot": "http://joinmastodon.org/ns#",
"votersCount": "toot:votersCount",
"Hashtag": "as:Hashtag"
}
],
"id": "https://mastodon.social/users/lobsters/statuses/114564741046953977",
"type": "Note",
"summary": null,
"inReplyTo": null,
"published": "2025-05-24T20:40:17Z",
"url": "https://mastodon.social/@lobsters/114564741046953977",
"attributedTo": "https://mastodon.social/users/lobsters",
"to": [
"https://www.w3.org/ns/activitystreams#Public"
],
"cc": [
"https://mastodon.social/users/lobsters/followers"
],
"sensitive": false,
"atomUri": "https://mastodon.social/users/lobsters/statuses/114564741046953977",
"inReplyToAtomUri": null,
"conversation": "tag:mastodon.social,2025-05-24:objectId=1005615498:objectType=Conversation",
"content": "<p>How I used o3 to find CVE-2025-37899, a remote zeroday vulnerability in the Linux kernel’s SMB implementation <a href=\"https://lobste.rs/s/uvw5lp\" target=\"_blank\" rel=\"nofollow noopener\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">lobste.rs/s/uvw5lp</span><span class=\"invisible\"></span></a> <a href=\"https://mastodon.social/tags/linux\" class=\"mention hashtag\" rel=\"tag\">#<span>linux</span></a> <a href=\"https://mastodon.social/tags/security\" class=\"mention hashtag\" rel=\"tag\">#<span>security</span></a> <a href=\"https://mastodon.social/tags/vibecoding\" class=\"mention hashtag\" rel=\"tag\">#<span>vibecoding</span></a><br /><a href=\"https://sean.heelan.io/2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/\" target=\"_blank\" rel=\"nofollow noopener\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">sean.heelan.io/2025/05/22/how-</span><span class=\"invisible\">i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/</span></a></p>",
"contentMap": {
"en": "<p>How I used o3 to find CVE-2025-37899, a remote zeroday vulnerability in the Linux kernel’s SMB implementation <a href=\"https://lobste.rs/s/uvw5lp\" target=\"_blank\" rel=\"nofollow noopener\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">lobste.rs/s/uvw5lp</span><span class=\"invisible\"></span></a> <a href=\"https://mastodon.social/tags/linux\" class=\"mention hashtag\" rel=\"tag\">#<span>linux</span></a> <a href=\"https://mastodon.social/tags/security\" class=\"mention hashtag\" rel=\"tag\">#<span>security</span></a> <a href=\"https://mastodon.social/tags/vibecoding\" class=\"mention hashtag\" rel=\"tag\">#<span>vibecoding</span></a><br /><a href=\"https://sean.heelan.io/2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/\" target=\"_blank\" rel=\"nofollow noopener\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">sean.heelan.io/2025/05/22/how-</span><span class=\"invisible\">i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/</span></a></p>"
},
"attachment": [],
"tag": [
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/linux",
"name": "#linux"
},
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/security",
"name": "#security"
},
{
"type": "Hashtag",
"href": "https://mastodon.social/tags/vibecoding",
"name": "#vibecoding"
}
],
"replies": {
"id": "https://mastodon.social/users/lobsters/statuses/114564741046953977/replies",
"type": "Collection",
"first": {
"type": "CollectionPage",
"next": "https://mastodon.social/users/lobsters/statuses/114564741046953977/replies?only_other_accounts=true&page=true",
"partOf": "https://mastodon.social/users/lobsters/statuses/114564741046953977/replies",
"items": []
}
},
"likes": {
"id": "https://mastodon.social/users/lobsters/statuses/114564741046953977/likes",
"type": "Collection",
"totalItems": 2
},
"shares": {
"id": "https://mastodon.social/users/lobsters/statuses/114564741046953977/shares",
"type": "Collection",
"totalItems": 0
}
}