Discourse: Secure uploads exposed by hotlinked image copying

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Summary

CVECVE-2026-45788
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-09 22:17:04 UTC
Updated2026-07-10 15:53:08 UTC
DescriptionDiscourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, secure uploads could be exposed by pull_hotlinked_images when an attacker knew the secured upload URL and the secure_uploads site setting was enabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Risk And Classification

Primary CVSS: v4.0 6.3 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-200 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Discourse Discourse affected >= 2026.1.0-latest, < 2026.1.5 Not specified
CNA Discourse Discourse affected >= 2026.4.0-latest, < 2026.4.2 Not specified
CNA Discourse Discourse affected >= 2026.5.0-latest, < 2026.5.1 Not specified

References

ReferenceSourceLinkTags
github.com/discourse/discourse/commit/8b4a959b251a856a9c911fb9f2ac34fbc3... [email protected] github.com
github.com/discourse/discourse/releases/tag/v2026.5.1 [email protected] github.com
github.com/discourse/discourse/releases/tag/v2026.6.0 [email protected] github.com
github.com/discourse/discourse/releases/tag/v2026.1.5 [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-3876-w96v-8v38 [email protected] github.com
github.com/discourse/discourse/releases/tag/v2026.4.2 [email protected] github.com
github.com/discourse/discourse/commit/fa74e0dec7341a858ab83a1977fa52629b... [email protected] github.com
github.com/discourse/discourse/commit/5807c426880eadf248006e851604fc9284... [email protected] github.com
github.com/discourse/discourse/commit/eff53af26367ae0dcb3a426954d233e8c7... [email protected] github.com
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