Medium severity · published Apr 3, 2026
CVE-2026-34947
Discourse: Staged user custom fields are exposed on public invite pages
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, staged user custom fields and username are exposed on public invite pages without email verification. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% 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, < 2026.1.3; >= 2026.2.0-latest, < 2026.2.2; >= 2026.3.0-latest, < 2026.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34947
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34947
Vendor Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-4rcw-wq9x-54qw
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