CVE-2025-48053

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

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.

Category

8.7
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.04%
Affected: discourse discourse
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2025-48053?
CVE-2025-48053 has been scored as a high severity vulnerability.
How to fix CVE-2025-48053?
To fix CVE-2025-48053, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-48053 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-48053 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-48053?
CVE-2025-48053 affects discourse discourse.
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