THREATPORT/VULNERABILITY/CVE-2023-36460
CRITICAL SEVERITY

CVE-2023-36460

Mastodon vulnerability

CVSS
9.9
EPSS
40.1%
EPSS pct
98th
Exploited
No known
Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 3.5.0 and prior to versions 3.5.9, 4.0.5, and 4.1.3, attackers using carefully crafted media files can cause Mastodon's media processing code to create arbitrary files at any location. This allows attackers to create and overwrite any file Mastodon has access to, allowing Denial of Service and arbitrary Remote Code Execution. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.
Affected vendor
Joinmastodon
Affected product
Mastodon
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2023-07-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 40.1% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2023-36460

  • Confirm whether Joinmastodon Mastodon is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2023-36460.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2023-36460

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2023-36460 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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