CVE-2024-37903 — Mastodon is a self-hosted, federated microblogging platform
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
Published
2024-07-05T17:24:49.213Z
Last modified
2024-08-02T04:04:23.423Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| mastodon | mastodon | >= 2.6.0, < 4.1.18, >= 4.2.0, < 4.2.10 |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
Open in Sigma generator →
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2024-07-05T17:24:49.213Z
- Last modified: 2024-08-02T04:04:23.423Z
09References
- github.com — https://github.com/mastodon/mastodon/security/advisories/GHSA-xjvf-fm67-4qc3
- github.com — https://github.com/mastodon/mastodon/commit/a1c7aae28aecf06659c5b18cfa131b37cd15…
- github.com — https://github.com/mastodon/mastodon/commit/d4bf22b632ea8b1174375c4966a6768ab663…
- github.com — https://github.com/mastodon/mastodon/releases/tag/v4.1.18
- github.com — https://github.com/mastodon/mastodon/releases/tag/v4.2.10
Want this in your SOAR or SIEM?
SARA's API returns EPSS, CVSS, KEV, and an analyst-grade summary in one call.
Read the API reference →