CVE-2026-22245: joinmastodon mastodon

csirt@kutim:~/threat-intel/cve/CVE-2026-22245

CVSS 7.5 · High EPSS 0,29%

Kerentanan Server-Side Request Forgery (SSRF) pada joinmastodon mastodon. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

Mastodon is a free, open-source social network server based on ActivityPub. By nature, Mastodon performs a lot of outbound requests to user-provided domains. Mastodon, however, has some protection mechanism to disallow requests to local IP addresses (unless specified in `ALLOWED_PRIVATE_ADDRESSES`) to avoid the "confused deputy" problem. The list of disallowed IP address ranges was lacking some IP address ranges that can be used to reach local IP addresses. An attacker can use an IP address in the affected ranges to make Mastodon perform HTTP requests against loopback or local network hosts, potentially allowing access to otherwise private resources and services. This is fixed in Mastodon v4.5.4, v4.4.11, v4.3.17 and v4.2.29.

Rincian

Terbit di NVD: 8 Januari 2026
Terakhir diubah: 17 Juni 2026
Status NVD: Analyzed
CVSS 3.1: 7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-918: Server-Side Request Forgery (SSRF)
EPSS (30 hari): 0,29% peluang dieksploitasi; lebih tinggi dari 19,9% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
joinmastodon	mastodon	Semua versi sebelum 4.2.29
joinmastodon	mastodon	Versi 4.3.0 hingga sebelum 4.3.17
joinmastodon	mastodon	Versi 4.4.0 hingga sebelum 4.4.11
joinmastodon	mastodon	Versi 4.5.0 hingga sebelum 4.5.4

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:11 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.