CVE-2026-27934
Discourse API visibility flaw exposes post titles and excerpts to unauthorized users.
Is CVE-2026-27934 being exploited?
Not confirmed. CVE-2026-27934 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.25% probability of exploitation in the next 30 days.
How severe is CVE-2026-27934?
CVE-2026-27934 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-27934?
Yes. A fix has been recorded for CVE-2026-27934. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27934 affect?
CVE-2026-27934 affects Discourse < 2026.3.0-latest.1, Discourse 2026.2.1, Discourse 2026.1.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27934?
Upgrade to patched version (>= 2026.3.0-latest.1).
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Info disclosure via user action API leaking titles/excerpts to unauthorized users.
Immediate action required
- affected>= 2026.1.0-latest and < 2026.1.2
- affected>= 2026.2.0-latest and < 2026.2.1
- affected= 2026.3.0-latest
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.