CVE-2026-27823
Authenticated RCE in EGroupware; unauth exploit possible if self-registration enabled.
Is CVE-2026-27823 being exploited?
Not confirmed. CVE-2026-27823 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 1.0% probability of exploitation in the next 30 days.
How severe is CVE-2026-27823?
CVE-2026-27823 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-2026-27823?
Yes. A fix has been recorded for CVE-2026-27823. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27823 affect?
CVE-2026-27823 affects EGroupware versions prior to 26.2.20260224 and prior to 23.1.20260224. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27823?
Apply vendor patches immediately; disable self-registration until patched; restrict/monitor access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can execute arbitrary commands and achieve full system compromise; unauthenticated exploit possible when self-registration is enabled.
Immediate action required
- affected<= 26.2.20260216
- affected<= 23.1.20260131
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.