Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') Affecting flarum/core package, versions <1.8.10
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-FLARUMCORE-9459899
- published17 Mar 2025
- disclosed12 Mar 2025
- creditUnknown
Introduced: 12 Mar 2025
CVE-2025-27794 (opens in a new tab)How to fix?
Upgrade flarum/core to version 1.8.10 or higher.
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 subdomain under the parent domain can set cookies scoped to the parent domain. This allows the attacker to replace session tokens for applications hosted on sibling subdomains if session tokens aren't rotated post-authentication.