Vulnerability · Published Jun 9, 2025 · Assigned by GitHub_M

CVE-2025-48053Discourse vulnerable to DoS via large URL payload in PM to a bot

High 8.7

In plain English

A high-severity uncontrolled resource consumption in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.4%top 67.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	< 3.4.4< 3.5.0.beta5< 3.5.0.beta6-dev

Weakness: CWE-400, CWE-770 · Vector: 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

References

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