PT-2026-69985 · Mastodon · Mastodon
CVE-2026-72916
·
Published
2026-08-10
·
Updated
2026-08-17
CVSS v4.0
6.3
Medium
| Vector | AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Name of the Vulnerable Software and Affected Versions
Mastodon versions prior to 4.4.21
Mastodon versions prior to 4.5.14
Mastodon versions prior to 4.6.4
Mastodon versions prior to 4.7.0-beta.1
Description
A Server-Side Request Forgery (SSRF) protection bypass exists in the
PrivateAddressCheck.private address? function within app/lib/private address check.rb. While the system normalized IPv4-mapped IPv6 addresses, it failed to recognize IPv4-compatible IPv6 addresses using IPAddr#ipv4 compat?. An attacker could use an address from this omitted range to bypass the ALLOWED PRIVATE ADDRESSES protection, forcing the server to send HTTP requests to loopback interfaces. This could allow unauthorized access to private resources and services, provided the underlying system supports the obsolete IPv4-compatible IPv6 mechanism.Recommendations
Update to version 4.4.21
Update to version 4.5.14
Update to version 4.6.4
Update to version 4.7.0-beta.1
Exploit
Fix
SSRF
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Related Identifiers
Affected Products
Mastodon