Affects widely used Zabbix monitoring software; blind SQLi via API; data exfiltration risk and admin compromise.
CVE-2026-23921
Blind SQL injection in Zabbix API enables data exfiltration.
Is CVE-2026-23921 being exploited?
Not confirmed. CVE-2026-23921 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 3.5% probability of exploitation in the next 30 days.
How severe is CVE-2026-23921?
CVE-2026-23921 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-2026-23921?
Yes. A fix has been recorded for CVE-2026-23921. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-23921 affect?
CVE-2026-23921 affects Zabbix, Zabbix API (CApiService.php). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-23921?
Patch when available; restrict API access; rotate creds.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Exfiltrate arbitrary DB data; potential session IDs and admin compromise via time-based SQLi.
Patch when possible
- affected>= 7.0.0 and <= 7.0.21
- affected>= 7.2.0 and <= 7.2.14
- affected>= 7.4.0 and <= 7.4.5
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.