What’s Vulnerable › Vulnerabilities

CVE-2024-35227: Discourse vulnerable to DoS through Onebox

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-03 · updated 2026-06-17
• Weakness: CWE-20

Description

Discourse is an open-source discussion platform. Prior to version 3.2.3 on the `stable` branch and version 3.3.0.beta3 on the `tests-passed` branch, Oneboxing against a carefully crafted malicious URL can reduce the availability of a Discourse instance. The problem has been patched in version 3.2.3 on the `stable` branch and version 3.3.0.beta3 on the `tests-passed` branch. There are no known workarounds available for this vulnerability.

Affected products

• discourse: through 3.2.2

References

• https://github.com/discourse/discourse/commit/10afe5fcf1ebf2e49cb80716d5e62e184c53519b
• https://github.com/discourse/discourse/commit/6ce5673d2c1a511b602e1b2ade6cdc898d14ab36
• https://github.com/discourse/discourse/security/advisories/GHSA-664f-xwjw-752c
• https://github.com/discourse/discourse/commit/10afe5fcf1ebf2e49cb80716d5e62e184c53519b
• https://github.com/discourse/discourse/commit/6ce5673d2c1a511b602e1b2ade6cdc898d14ab36
• https://github.com/discourse/discourse/security/advisories/GHSA-664f-xwjw-752c

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