CVE-2025-48053

Discourse vulnerable to DoS via large URL payload in PM to a bot

State: Published
Severity: 8.7 High
Published: Jun 9, 2025
Updated: Jun 9, 2025
Reserved: May 15, 2025

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, sending a malicious URL in a PM to a bot user can cause a reduced the availability of a Discourse instance. 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. No known workarounds are available.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
discoursediscourse	< 3.4.4Affected < 3.5.0.beta5Affected < 3.5.0.beta6-devAffected

References

https://github.com/discourse/discourse/security/advisories/GHSA-3q5q-qmrm-rvwx

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