CVE•Published 2026-06-24•Modified 2026-06-25•0 articles on news•5 live references•NVD data
CVE-2026-48028
Vulnerability data via NVD (ingested)
CVSS v3.1
6.5
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
EPSS percentile
2
Exploit Prediction Scoring System · top 98% of all CVEs
Weaknesses (CWE)
Description
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, Mastodon's normalization of incoming activities signed with Linked-Data Signatures does not sufficiently protect the activities from a certain class of spoofing, allowing threat actors to remove JSON entries from valid signed activities from a third-party actor. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.
Timeline
Published 2026-06-24
Modified 2026-06-25
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
More intel sources (5)
Shodan report
vuln:CVE-2026-48028Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-48028Censys host search filtered to this CVE id.
grep.app
CVE-2026-48028Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-48028GitHub code search for direct mentions.
Google dork
"CVE-2026-48028" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-48028 on GitHub.
We haven't classified any articles referencing CVE-2026-48028 yet. The external references above still apply.