Auth bypass in Joinmastodon Mastodon
CVE-2024-37903
Mastodon is a self-hosted, federated microblogging platform. Starting in version 2.6.0 and prior to versions 4.1.18 and 4.2.10, by crafting specific activities, an attacker can extend the audience of a post they do not own to other Mastodon users on a target server, thus gaining access to the contents of a post not intended for them. Versions 4.1.18 and 4.2.10 contain a patch for this issue.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Joinmastodon Mastodon
- Mastodon — versions >= 2.6.0, < 4.1.18, >= 4.2.0, < 4.2.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/mastodon/mastodon/security/advisories/GHSA-xjvf-fm67-4qc3 (Vendor Advisory)
- github.com/mastodon/mastodon/commit/a1c7aae28aecf06659c5b18cfa131b37cd1512a3 (Patch)
- github.com/mastodon/mastodon/commit/d4bf22b632ea8b1174375c4966a6768ab66393b6 (Patch)
- github.com/mastodon/mastodon/releases/tag/v4.1.18 (Release Notes)
- github.com/mastodon/mastodon/releases/tag/v4.2.10 (Release Notes)
Frequently asked questions
- What is CVE-2024-37903?
- CVE-2024-37903 is a high-severity vulnerability in Joinmastodon Mastodon, classified under Missing Authorization. CVSS score: 8.2/10. Published 2024-07-05.
- How severe is CVE-2024-37903?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2024-37903 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.