CVE-2025-48053

HIGH

Discourse < 3.4.4 and < 3.5.0 - Denial of Service via Malicious URL in Private Message

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0065
EPSS Percentile 70.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-770 CWE-400
Status published
Products (3)
discourse/discourse 3.5.0 beta1 (4 CPE variants)
discourse/discourse < 3.4.4
discourse/discourse < 3.5.0
Published Jun 09, 2025
Tracked Since Feb 18, 2026