ZDF
Sign inSign up

Vulnerabilities

Security fix · CVE-2025-48877

Discourse is an open-source discussion platform.

Published Jun 9, 2025 · catalog updated Jun 9, 2025 · Discourse is an open-source

Check if you run it

No confirmed exploitation is on record for CVE-2025-48877. EPSS is 0.41%. Act only if a listed version of Discourse is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Discourse is an open-source).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.41%
Remediation
Version ranges on file
Affected products
vendor discourse discourse < 3.4.4

Discourse is an open-source discussion platform. Prior to version 3.4.4 of the branch, version 3.5.0.beta5 of the branch, and version 3.5.0.beta6-dev of the branch, Codepen is present in the default 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 branch, version 3.5.0.beta5 of the branch, and version 3.5.0.beta6-dev of the branch. As a workaround, the Codepen prefix can be removed from a site's .

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor discourse discourse < 3.4.4< 3.4.4

How to fix CVE-2025-48877

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-48877. EPSS is 0.41%. Act only if a listed version of Discourse is an open-source is installed.

Which versions are affected?

Compare what you have installed with discourse discourse < 3.4.4 < 3.4.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 9, 2025 · EUVD

    Detected

    Discourse is an open-source discussion platform. Prior to version 3.4.4 of the branch, version 3.5.0.beta5 of the branch, and version 3.5.0.beta6-dev of the branch, Codepen is present in the default 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 branch, version 3.5.0.beta5 of the branch, and version

  2. Jun 9, 2025 · EUVD

    Updated

    Discourse is an open-source discussion platform. Prior to version 3.4.4 of the branch, version 3.5.0.beta5 of the branch, and version 3.5.0.beta6-dev of the branch, Codepen is present in the default 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 branch, version 3.5.0.beta5 of the branch, and version

Sources

  • CVE.orgVulnerability recordCVE-2025-48877

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-48877

    30-day exploitation probability 0.4%

    first.org
  • EUVDVulnerability recordEUVD-2025-17469

    Discourse is an open-source discussion platform. Prior to version 3.4.4 of the branch, version 3.5.0.beta5 of the branch, and version 3.5.0.beta6-dev of the branch, Codepen is present in the default site setting, and it can potentially auto-run arbitrary JS in the iframe scope, w

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.