What is CVE-2026-27934?

CVE-2026-27934 is a high-severity vulnerability in Discourse, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 7.5/10. Published 2026-03-19.

How severe is CVE-2026-27934?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Discourse

CVE-2026-27934

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a lack of visibility checks with a user action API endpoint that results in disclosure of the title and post excerpt to unauthorized users, leading to information disclosure. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

EPSS: 0.003 (17.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Discourse — versions = 2026.3.0-latest, >= 2026.2.0-latest, < 2026.2.1, >= 2026.1.0-latest, < 2026.1.2

Weakness classification (CWE)

CWE-201 — Insertion of Sensitive Information into Sent Data

References

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

Frequently asked questions

What is CVE-2026-27934?: CVE-2026-27934 is a high-severity vulnerability in Discourse, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 7.5/10. Published 2026-03-19.
How severe is CVE-2026-27934?: High severity. CVSS v3 base score is 7.5 out of 10.