What is CVE-2025-48877?

CVE-2025-48877 is a critical-severity vulnerability in Discourse, classified under CWE-1038. CVSS score: 9.8/10. Published 2025-06-09.

How severe is CVE-2025-48877?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-48877 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Discourse

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_…

EPSS: 0.003 (27.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Discourse — versions < 3.5.0.beta5, < 3.4.4, 3.5.0

Weakness classification (CWE)

CWE-1038

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2025-48877?: CVE-2025-48877 is a critical-severity vulnerability in Discourse, classified under CWE-1038. CVSS score: 9.8/10. Published 2025-06-09.
How severe is CVE-2025-48877?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-48877 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.