CVE-2025-48877
Discourse is an open-source discussion platform. Prior to version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch, Codepen is present in the default `allowed_iframes` site setting, and it can potentially auto-run arbitrary JS in the iframe scope, which is unintended. This issue is patched in version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch. As a workaround, the Codepen prefix can be removed from a site's `allowed_iframes`.
- Discourse
- < 3.4.4, 3.5.0
- Fix
- Available
- CVSS 3.1
- 9.8 CRITICAL
- EPSS
- 0.3% (28th percentile)
- Weakness
- CWE-1038
- NVD status
- Analyzed
- Published
- 2025-06-09
No indexed exploits for CVE-2025-48877 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2025-48877 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.