CVE-2025-27794

Katalog CVE

CVSS 6.8 · Medium EPSS 0,50%

Kerentanan Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') pada flarum. Skor CVSS 3.1 6.8 (Medium) menurut NVD.

Deskripsi (NVD)

Flarum is open-source forum software. A session hijacking vulnerability exists in versions prior to 1.8.10 when an attacker-controlled authoritative subdomain under a parent domain (e.g., `subdomain.host.com`) sets cookies scoped to the parent domain (`.host.com`). This allows session token replacement for applications hosted on sibling subdomains (e.g., `community.host.com`) if session tokens aren't rotated post-authentication. Key Constraints are that the attacker must control any subdomain under the parent domain (e.g., `evil.host.com` or `x.y.host.com`), and the parent domain must not be on the Public Suffix List. Due to non-existent session token rotation after authenticating we can theoretically reproduce the vulnerability by using browser dev tools, but due to the browser's security measures this does not seem to be exploitable as described. Version 1.8.10 contains a patch for the issue.

Rincian

Terbit di NVD

12 Maret 2025

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

6.8 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

EPSS (30 hari)

0,50% peluang dieksploitasi; lebih tinggi dari 41,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/flarum/framework/security/advisories/GHSA-hg9j-64wp-m9px advisory vendor
• https://github.com/flarum/framework/commit/a05aaea3ee1e0a8b870935183193cd6052f1d402 patch
• https://github.com/flarum/framework/releases/tag/v1.8.10 release notes