#ZeroDay
Live, measured metrics for the hashtag #ZeroDay from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.
Own #zeroday
This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.
Day-by-day usage
measured · fosstodon.org (Mastodon public tags API) · fetched 2026-09-09 21:53 UTC59 uses by 26 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.
Related hashtags
measured · fosstodon.org (Mastodon public search API) · fetched 2026-09-09 21:53 UTCLive pulse
measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-09-09 21:53 UTCEverything below is measured over the latest 40 public posts (spanning ~60 hours).
Posting hours (UTC) — busiest: 13:00
Languages: English (37) · German (2) · Italian (1)
Avg boosts / post: 0.2
Top of the latest posts
ConnectWise ScreenConnect #zeroday CVE-2026-84869 Huntress article: https://www.huntress.com/blog/rogue-screenconnect-installations Canadian Centre for Cyber Security: https://www.cyber.gc.ca/en/alerts-advisories/connectwise-security-adviso
Microsoft Defender Exposed to New Zero-Day Exploit A security researcher known as Nightmare Eclipse has just dropped a proof-of-concept exploit for a new Microsoft Defender zero-day vulnerability, dubbed ShieldCrash, which surprisingly stil
New. Proofpoint: Once in a BlueMoon: Multiple State-Aligned Threat Actors Rapidly Adopt Novel Exploit Chain Using Chrome and Windows Zero-Days https://www.proofpoint.com/us/blog/threat-insight/once-bluemoon-multiple-state-aligned-threat-act
#zeroday across platforms
every network with a public tag surfaceFollow #zeroday straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.
Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/zeroday