CVE-2025-27794 is a session hijacking vulnerability affecting Flarum versions prior to 1.8.10. It allows an attacker controlling an authoritative subdomain to set cookies scoped to the parent domain, enabling session token replacement for applications on sibling subdomains due to a lack of session token rotation post-authentication. Rated 6.8 MEDIUM (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N), this vulnerability requires high attack complexity and user interaction, potentially leading to high confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.8.0CPE matchmatch criteria | cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.2 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.