CVE-2023-22488

Flarum is a forum software for building communities. Using the notifications feature, one can read restricted/private content and bypass access checks that would be in place for such content. The notification-sending component does not check that the subject of the notification can be seen by the...

CVE-2023-22487

Flarum is a forum software for building communities. Using the mentions feature provided by the flarum/mentions extension, users can mention any post ID on the forum with the special @""p syntax. The following behavior never changes no matter if the actor should be able to read the mentioned post...

CVE-2023-22489

Flarum is a discussion platform for websites. If the first post of a discussion is permanently deleted but the discussion stays visible, any actor who can view the discussion is able to create a new reply via the REST API, no matter the reply permission or lock status. This includes users that...

CVE-2023-27577

flarum is a forum software package for building communities. In versions prior to 1.7.0 an admin account which has already been compromised by an attacker may use a vulnerability in the LESS parser which can be exploited to read sensitive files on the server through the use of path traversal...

CVE-2021-21283

Flarum is an open source discussion platform for websites. The "Flarum Sticky" extension versions 0.1.0-beta.14 and 0.1.0-beta.15 has a cross-site scripting vulnerability. A change in release beta 14 of the Sticky extension caused the plain text content of the first post of a pinned discussion to...

CVE-2021-32671

Flarum is a forum software for building communities. Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 our last beta before v1.0.0 and was not noticed or documented. This allowed for any user to type...

CVE-2019-13183

Flarum before 0.1.0-beta.9 allows CSRF against all POST endpoints, as demonstrated by changing admin settings...

CVE-2019-11514

User/Command/ConfirmEmailHandler.php in Flarum before 0.1.0-beta.8 mishandles invalidation of user email tokens...

Session Hijacking

flarum/core is vulnerable to Session Hijacking. The vulnerability is due to improper scoping of cookies, allowing an attacker-controlled subdomain to set cookies for the parent domain...

CVE-2025-27794

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 f...

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

Overview flarum/core is a simple discussion platform for your website. Affected versions of this package are vulnerable to Improper Neutralization of Special Elements in Output Used by a Downstream Component 'Injection' via authoritative subdomain cookie overwrite. An attacker controlling a...

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

Overview Affected versions of this package are vulnerable to Improper Neutralization of Special Elements in Output Used by a Downstream Component 'Injection' via authoritative subdomain cookie overwrite. An attacker controlling a subdomain under the parent domain can set cookies scoped to the...

CVE-2025-27794

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 f...

CVE-2025-27794 Flarum Vulnerable to Session Hijacking via Authoritative Subdomain Cookie Overwrite

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 f...

CVE-2025-27794

Summary: CVE-2025-27794 affects Flarum versions prior to 1.8.10, where an attacker-controlled authoritative subdomain can set cookies for the parent domain, potentially enabling session hijacking on sibling subdomains. What is affected: Flarum core (pre-1.8.10) with cookies scoped to a parent dom...

CVE-2025-27794 Flarum Vulnerable to Session Hijacking via Authoritative Subdomain Cookie Overwrite

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 f...

CVE-2025-27794 Flarum Vulnerable to Session Hijacking via Authoritative Subdomain Cookie Overwrite

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 f...

CVE-2025-27794

creationtimestamp| type| source ---|---|--- 2025-03-12 10:22:26+00:00| published-proof-of-concept| https://github.com/flarum/framework/security/advisories/GHSA-hg9j-64wp-m9px...

PT-2025-11049 · Flarum · Flarum

Name of the Vulnerable Software and Affected Versions: Flarum versions prior to 1.8.10 Description: A session hijacking issue exists when an attacker-controlled authoritative subdomain under a parent domain sets cookies scoped to the parent domain. This allows session token replacement for...

Flarum 注入漏洞

Flarum is a simple forum software for building communities from Flarum open source. An injection vulnerability exists in Flarum versions prior to 1.8.10, which stems from an attacker-controlled subdomain being able to set a parent domain's cookie, leading to session hijacking...