# Mastodon vulnerabilities

Source: https://junglewise.ai/threats/technologies/mastodon  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/mastodon.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 8 vulnerabilities in Mastodon: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-59825, was published on 18 August 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 8 (0 critical, 0 exploited in the wild)

## About Mastodon

Mastodon is a free, open-source decentralized social media platform based on the ActivityPub protocol.

## Latest Mastodon vulnerabilities

- [CVE-2026-59825: Mastodon LDAP authentication global TLS verification bypass](https://junglewise.ai/threats/cve-2026-59825-mastodon-ldap-authentication-global-tls-verification-bypass) (high, CVSS 7.4, published 18 Aug 2026)
- [CVE-2026-50129: Mastodon denial of service via uncaught exception in math sanitizer](https://junglewise.ai/threats/cve-2026-50129-mastodon-denial-of-service-via-uncaught-exception-in-math) (high, CVSS 7.5, published 24 Jun 2026)
- [CVE-2026-50128: Mastodon signature verification bypass in attributionDomains spoofing](https://junglewise.ai/threats/cve-2026-50128-mastodon-signature-verification-bypass-in-attributiondomains) (medium, CVSS 5.3, published 24 Jun 2026)
- [CVE-2026-48028: Mastodon spoofing via JSON entry removal in signed activities](https://junglewise.ai/threats/cve-2026-48028-mastodon-spoofing-via-json-entry-removal-in-signed-activities) (medium, CVSS 6.5, published 24 Jun 2026)
- [CVE-2026-47389: Mastodon SSRF protection bypass in PrivateAddressCheck](https://junglewise.ai/threats/cve-2026-47389-mastodon-ssrf-protection-bypass-in-privateaddresscheck) (high, CVSS 8.6, published 24 Jun 2026)
- [CVE-2026-46349: Mastodon signature bypass via JSON-LD restructuring](https://junglewise.ai/threats/cve-2026-46349-mastodon-signature-bypass-via-json-ld-restructuring) (medium, CVSS 5.3, published 24 Jun 2026)
- [CVE-2026-46348: Mastodon SSRF via IPv6 loopback bypass](https://junglewise.ai/threats/cve-2026-46348-mastodon-ssrf-via-ipv6-loopback-bypass) (info, CVSS 8.7, published 24 Jun 2026)
- [CVE-2026-47777: Mastodon authorization bypass in experimental Collections feature](https://junglewise.ai/threats/cve-2026-47777-mastodon-authorization-bypass-in-experimental-collections-feature) (high, CVSS 7.5, published 15 Jun 2026)

## Most severe Mastodon vulnerabilities

- [CVE-2026-47389: Mastodon SSRF protection bypass in PrivateAddressCheck](https://junglewise.ai/threats/cve-2026-47389-mastodon-ssrf-protection-bypass-in-privateaddresscheck) (high, CVSS 8.6, published 24 Jun 2026)
- [CVE-2026-50129: Mastodon denial of service via uncaught exception in math sanitizer](https://junglewise.ai/threats/cve-2026-50129-mastodon-denial-of-service-via-uncaught-exception-in-math) (high, CVSS 7.5, published 24 Jun 2026)
- [CVE-2026-47777: Mastodon authorization bypass in experimental Collections feature](https://junglewise.ai/threats/cve-2026-47777-mastodon-authorization-bypass-in-experimental-collections-feature) (high, CVSS 7.5, published 15 Jun 2026)
- [CVE-2026-59825: Mastodon LDAP authentication global TLS verification bypass](https://junglewise.ai/threats/cve-2026-59825-mastodon-ldap-authentication-global-tls-verification-bypass) (high, CVSS 7.4, published 18 Aug 2026)
- [CVE-2026-48028: Mastodon spoofing via JSON entry removal in signed activities](https://junglewise.ai/threats/cve-2026-48028-mastodon-spoofing-via-json-entry-removal-in-signed-activities) (medium, CVSS 6.5, published 24 Jun 2026)
- [CVE-2026-50128: Mastodon signature verification bypass in attributionDomains spoofing](https://junglewise.ai/threats/cve-2026-50128-mastodon-signature-verification-bypass-in-attributiondomains) (medium, CVSS 5.3, published 24 Jun 2026)
- [CVE-2026-46349: Mastodon signature bypass via JSON-LD restructuring](https://junglewise.ai/threats/cve-2026-46349-mastodon-signature-bypass-via-json-ld-restructuring) (medium, CVSS 5.3, published 24 Jun 2026)
- [CVE-2026-46348: Mastodon SSRF via IPv6 loopback bypass](https://junglewise.ai/threats/cve-2026-46348-mastodon-ssrf-via-ipv6-loopback-bypass) (info, CVSS 8.7, published 24 Jun 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 1 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Mastodon vulnerabilities", https://junglewise.ai/threats/technologies/mastodon, 9 November 2026.