Medium 6.3Published Jul 9, 2026

CVE-2026-45788Discourse: Secure uploads exposed by hotlinked image copying

Updated under an hour ago (Oct 28, 2026, 7:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Discourse 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.

CVSS: 6.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

discourse discourse discourse:discourse (from the name)	from 2026.1.0-latest, < 2026.1.5; from 2026.4.0-latest, < 2026.4.2; from 2026.5.0-latest, < 2026.5.1	CNA record
discourse discourse discourse:discourse	from 2026.1.0 before 2026.1.5; from 2026.4.0 before 2026.4.2; from 2026.5.0 before 2026.5.1; 2026.6.0	NVD

References

References

https://github.com/discourse/discourse/security/advisories/GHSA-3876-w96v-8v38	x-refsource-confirm, vendor-advisory
https://github.com/discourse/discourse/commit/5807c426880eadf248006e851604fc9284327ce5	x-refsource-misc, patch
https://github.com/discourse/discourse/commit/8b4a959b251a856a9c911fb9f2ac34fbc31a7471	x-refsource-misc, patch
https://github.com/discourse/discourse/commit/eff53af26367ae0dcb3a426954d233e8c7449f95	x-refsource-misc, patch
https://github.com/discourse/discourse/commit/fa74e0dec7341a858ab83a1977fa52629bced1aa	x-refsource-misc, patch
https://github.com/discourse/discourse/releases/tag/v2026.1.5	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.4.2	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.5.1	x-refsource-misc, release-notes
https://github.com/discourse/discourse/releases/tag/v2026.6.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.