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Medium severity · published Jul 9, 2026
CVE-2026-45780
Discourse: Private event sample invitees are serialized to non-invited event viewers
4.3
CVSS
0.5%
EPSS
No
On KEV
Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, EventSerializer could expose invited group names, sample invitees, and attendance statistics to users who could view the topic but were not entitled to view the private event invitee list. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
>= 2026.1.0-latest, < 2026.1.5; >= 2026.4.0-latest, < 2026.4.2; >= 2026.5.0-latest, < 2026.5.1 · source: vendor, NVD
Affected product
DI
discourse
discourse
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45780
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45780
Patch
https://github.com/discourse/discourse/commit/37969503f20369eb1712b7b88daedcfb4f63f5f1
Patch
https://github.com/discourse/discourse/commit/4d46638041b5f3d1e1f7f6f6f19c1df3bd65a586
Patch
https://github.com/discourse/discourse/commit/6457ab71f36a2d1440fe96af0a2593897844b023
Patch
https://github.com/discourse/discourse/commit/7deb4b6963442569357b41e61febe37594e5e730
Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.1.5
Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.4.2
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