Discourse: Regular users can route multipart uploads into the admin backup store
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.4%
exploitation probability
0.4%top 71% of all CVEs
observed exploitation
nono source reports it
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, regular users could route direct S3 multipart uploads through ExternalUploadManager into the admin backup store. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected products
discourse · discourseReferences
https://github.com/discourse/discourse/commit/1f1ded8dd361d81786bff17b35e1138d6ee299c0https://github.com/discourse/discourse/commit/7ddde266617b452152c1bf5f903f6c07be38fc40https://github.com/discourse/discourse/commit/a53df26dcf7e50ce2b20bfd5454a0c9d44b8fc7dhttps://github.com/discourse/discourse/commit/abaa664c5df84026efb2ca264ba0f5586c3f2b01https://github.com/discourse/discourse/releases/tag/v2026.1.5https://github.com/discourse/discourse/releases/tag/v2026.4.2https://github.com/discourse/discourse/releases/tag/v2026.5.1https://github.com/discourse/discourse/releases/tag/v2026.6.0https://github.com/discourse/discourse/security/advisories/GHSA-3mvf-q9rg-w6m7