CVE-2026-48028
Last modified
CVE-2026-48028 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.12% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness Enumeration
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-48028?
How severe is CVE-2026-48028?
How do I fix CVE-2026-48028?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-48020Traefik is an HTTP reverse proxy and load balancer. Prior to…10
- CVE-2026-48021In epa4all, prior to version 2026-05-20, an attacker who can…9.1
- CVE-2026-48022@hapi/wreck is an HTTP client utility. Prior to 18.1.2, Wrec…6.5
- CVE-2026-48025nebula-mesh is a self-hosted control plane for Slack Nebula …6.9
- CVE-2026-48026lakeFS is an open-source tool that transforms object storage…8.7
- CVE-2026-48027Nx Console is the user interface for Nx & Lerna. On 19 May 2…9.8
- CVE-2026-48029libheif is a HEIF and AVIF file format decoder and encoder. …7.1
- CVE-2026-4803The Royal Elementor Addons plugin for WordPress is vulnerabl…7.2
- CVE-2026-48030Pheditor is a single-file editor and file manager written in…9.9
- CVE-2026-48031go-base is a Go RESTful API Boilerplate template with JWT Au…9.1
- CVE-2026-48032Hulumi is an open-source toolkit that ships secure-by-defaul…8.3
- CVE-2026-48033Hulumi is an open-source toolkit that ships secure-by-defaul…8.4
Are you affected by CVE-2026-48028?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST