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5.9

Discourse's SSRF protection missing for some FastImage requests

CVE-2023-28112 · published 3 years ago
Summary

Discourse is an open-source discussion platform. Prior to version 3.1.0.beta3 of the `beta` and `tests-passed` branches, some user provided URLs were being passed to FastImage without SSRF protection. Insufficient protections could enable attackers to trigger outbound network connections from the Di...

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
discourse discourse < 3.1.0
<= 3.1.0
3.1.0
cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:*
Original advisory text
Discourse's SSRF protection missing for some FastImage requests
Discourse is an open-source discussion platform. Prior to version 3.1.0.beta3 of the `beta` and `tests-passed` branches, some user provided URLs were being passed to FastImage without SSRF protection. Insufficient protections could enable attackers to trigger outbound network connections from the Discourse server to private IP addresses. This affects any site running the `tests-passed` or `beta` branches versions 3.1.0.beta2 and prior. This issue is patched in version 3.1.0.beta3 of the `beta` and `tests-passed` branches. There are no known workarounds.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
5.9 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-918Server-Side Request Forgery (SSRF)
Timeline
Published17 Mar 2023
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2023-28112 · NVD
CVE-2023-28112 · OSV
GHSA-9897-x229-55gh · GHSA
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