What is CVE-2026-34947?

CVE-2026-34947 is a medium-severity vulnerability in Discourse, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-03.

How severe is CVE-2026-34947?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Discourse

CVE-2026-34947

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.

Vulnerability class: Information Disclosure

EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Discourse — versions >= 2026.3.0-latest, < 2026.3.0, >= 2026.2.0-latest, < 2026.2.2, >= 2026.1.0-latest, < 2026.1.3

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34947?: CVE-2026-34947 is a medium-severity vulnerability in Discourse, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-03.
How severe is CVE-2026-34947?: Medium severity. CVSS v3 base score is 5.3 out of 10.