CVE-2025-48877CRITICAL 9.8EPSS p26.5%
CVE-2025-48877CVE-2025-48877
Description
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`.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.35% probability of exploitation · percentile 26.5% · 2026-06-19T12:03:05Z |
| Published | 2025-06-09 |
| Last modified | 2025-09-25 |
Underlying weaknesses· 1
References
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Insecure Automated Optimizationscwe-1038 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.