What’s Vulnerable › Vulnerabilities

CVE-2023-49952

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-18 · updated 2026-06-17
• Weakness: CWE-79

Description

Mastodon 4.1.x before 4.1.17 and 4.2.x before 4.2.9 allows a bypass of rate limiting via a crafted HTTP request header.

Affected products

• mastodon: from 4.1.0 before 4.1.17; from 4.2.0 before 4.2.9 — fixed in 4.1.17, 4.2.9

How to fix

Upgrade to a fixed version: mastodon 4.1.17, 4.2.9. Check the vendor advisory for mitigations.

References

• https://github.com/mastodon/mastodon/security
• https://github.com/mastodon/mastodon/security/advisories/GHSA-c2r5-cfqr-c553

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