CVE-2026-46413
Discourse: Regular users can route multipart uploads into the admin backup store
Description
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.
INFO
Published Date :
July 9, 2026, 10:17 p.m.
Last Modified :
July 14, 2026, 8:41 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Discourse to version 2026.6.0 or later.
- Apply security patches for affected versions.
- Review S3 upload configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46413.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46413 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46413
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46413 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46413 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* versions from (including) 2026.1.0 up to (excluding) 2026.1.5 *cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* versions from (including) 2026.4.0 up to (excluding) 2026.4.2 *cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* versions from (including) 2026.5.0 up to (excluding) 2026.5.1 *cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:* Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/commit/1f1ded8dd361d81786bff17b35e1138d6ee299c0 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/commit/7ddde266617b452152c1bf5f903f6c07be38fc40 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/commit/a53df26dcf7e50ce2b20bfd5454a0c9d44b8fc7d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/commit/abaa664c5df84026efb2ca264ba0f5586c3f2b01 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/releases/tag/v2026.1.5 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/releases/tag/v2026.4.2 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/releases/tag/v2026.5.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/releases/tag/v2026.6.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/security/advisories/GHSA-3mvf-q9rg-w6m7 Types: Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 10, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-46413', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-10T14:32:30.407572Z'} -
New CVE Received by [email protected]
Jul. 09, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'discourse', 'product': 'discourse', 'versions': [{'status': 'affected', 'version': '>= 2026.1.0-latest, < 2026.1.5'}, {'status': 'affected', 'version': '>= 2026.4.0-latest, < 2026.4.2'}, {'status': 'affected', 'version': '>= 2026.5.0-latest, < 2026.5.1'}]}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N Added CWE CWE-862 Added Reference https://github.com/discourse/discourse/commit/1f1ded8dd361d81786bff17b35e1138d6ee299c0 Added Reference https://github.com/discourse/discourse/commit/7ddde266617b452152c1bf5f903f6c07be38fc40 Added Reference https://github.com/discourse/discourse/commit/a53df26dcf7e50ce2b20bfd5454a0c9d44b8fc7d Added Reference https://github.com/discourse/discourse/commit/abaa664c5df84026efb2ca264ba0f5586c3f2b01 Added Reference https://github.com/discourse/discourse/releases/tag/v2026.1.5 Added Reference https://github.com/discourse/discourse/releases/tag/v2026.4.2 Added Reference https://github.com/discourse/discourse/releases/tag/v2026.5.1 Added Reference https://github.com/discourse/discourse/releases/tag/v2026.6.0 Added Reference https://github.com/discourse/discourse/security/advisories/GHSA-3mvf-q9rg-w6m7