Denial-of-Service Vulnerability in Discourse Discussion Platform
CVE-2025-48053

8.7HIGH

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
9 June 2025

What is CVE-2025-48053?

This vulnerability affects the Discourse discussion platform, wherein a maliciously crafted URL sent through a private message to a bot user can degrade the availability of the Discourse instance. Affected versions include those prior to 3.4.4 in the stable branch, 3.5.0.beta5 in the beta branch, and 3.5.0.beta6-dev in the tests-passed branch. Users are urged to upgrade to the patched versions to mitigate potential disruptions, as no known workarounds exist.

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Deploy the Patch

Affected Version(s)

discourse < 3.4.4 < 3.4.4

discourse < 3.5.0.beta5 < 3.5.0.beta5

discourse < 3.5.0.beta6-dev < 3.5.0.beta6-dev

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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