What’s Vulnerable › Vulnerabilities

CVE-2024-37157: Discourse vulnerable to Server-Side Request Forgery via FastImage

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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-918

Description

Discourse is an open-source discussion platform. Prior to version 3.2.3 on the `stable` branch and version 3.3.0.beta4 on the `beta` and `tests-passed` branches, a malicious actor could get the FastImage library to redirect requests to an internal Discourse IP. This issue is patched in version 3.2.3 on the `stable` branch and version 3.3.0.beta4 on the `beta` and `tests-passed` branches. No known workarounds are available.

Affected products

• discourse: before 3.2.3; before 3.3.0; 3.3.0-beta1, 3.3.0-beta2, 3.3.0-beta3 — fixed in 3.2.3, 3.3.0

How to fix

Upgrade to a fixed version: discourse 3.2.3, 3.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/discourse/discourse/commit/5b8cf11b69e05d5c058c1148ec69ec309491fa6e
• https://github.com/discourse/discourse/commit/67e78086035cec494b15ce79342a0cb9052c2d95
• https://github.com/discourse/discourse/security/advisories/GHSA-46pq-7958-fc68
• https://github.com/discourse/discourse/commit/5b8cf11b69e05d5c058c1148ec69ec309491fa6e
• https://github.com/discourse/discourse/commit/67e78086035cec494b15ce79342a0cb9052c2d95
• https://github.com/discourse/discourse/security/advisories/GHSA-46pq-7958-fc68

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