CVE-2026-33869
Last modified
CVE-2026-33869 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The vulnerability has been patched in Mastodon 4.5.8 and 4.4.15. Mastodon 4.3 and earlier are not affected because they do not support quotes.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Joinmastodon | Mastodon | >= 4.4.0, < 4.4.15 |
| Joinmastodon | Mastodon | >= 4.5.0, < 4.5.8 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-33869?
How severe is CVE-2026-33869?
How do I fix CVE-2026-33869?
How Strix Helps
- Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
- 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-2026-3386A flaw has been found in wren-lang wren up to 0.4.0. Affecte…7.1
- CVE-2026-33862A vulnerability has been identified in Teamcenter V2312 (All…6.1
- CVE-2026-33865MLflow is vulnerable to Stored Cross-Site Scripting (XSS) ca…5.4
- CVE-2026-33866MLflow is vulnerable to an authorization bypass affecting th…4.3
- CVE-2026-33867WWBN AVideo is an open source video platform. In versions up…7.5
- CVE-2026-33868Mastodon is a free, open-source social network server based …6.1
- CVE-2026-3387A vulnerability has been found in wren-lang wren up to 0.4.0…5.5
- CVE-2026-33870Netty is an asynchronous, event-driven network application f…7.5
- CVE-2026-33871Netty is an asynchronous, event-driven network application f…7.5
- CVE-2026-33872elixir-nodejs provides an Elixir API for calling Node.js fun…7.1
- CVE-2026-33873Langflow is a tool for building and deploying AI-powered age…9.9
- CVE-2026-33874Gematik Authenticator securely authenticates users for login…7.8
Are you affected by CVE-2026-33869?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST