CVE-2025-48877

CRITICALNVD 9.89.8—Trending — 3 sources updated this week

9.8

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.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 72.1%
KEV: Not listed

Published

June 9, 2025

Last Modified

September 25, 2025

References (1)

security-advisories@githubhttps://github.com/discourse/discourse/security/advisories/GHSA-cm93-6m2m-cjcv

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-1038

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-30 04:01 UTCEG score recompute
2026-05-29 22:50 UTCOSV refresh
2026-05-29 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2025-48877?

CVE-2025-48877 is a critical vulnerability published on June 9, 2025. 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 allowediframes site setting, and it can potentially auto-run arbitrary JS…

When was CVE-2025-48877 disclosed?

CVE-2025-48877 was first published in the National Vulnerability Database on June 9, 2025, with the most recent update on September 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-48877 actively exploited?

CVE-2025-48877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-48877?

CVE-2025-48877 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2025-48877?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-48877, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-48877

📅 Published

🔄 Last Modified

🔗 References (1)