CVE-2026-23921
CVE-2026-23921 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.
Key facts
- Severity: High (CVSS 4.0 base score 8.7)
- EPSS exploit prediction: 0% (15th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-14955
- Weakness: CWE-89
- Published:
- Last modified:
Description
A low privilege Zabbix user with API access can exploit a blind SQL injection vulnerability in include/classes/api/CApiService.php to execute arbitrary SQL selects via the sortfield parameter. Although query results are not returned directly, an attacker can exfiltrate arbitrary database data through time-based techniques, potentially leading to session identifier disclosure and administrator account compromise.
Frequently asked questions
- What is CVE-2026-23921?
- A low privilege Zabbix user with API access can exploit a blind SQL injection vulnerability in include/classes/api/CApiService.php to execute arbitrary SQL selects via the sortfield parameter. Although query results are not returned directly, an attacker can exfiltrate arbitrary database data through time-based techniques, potentially leading to session identifier disclosure and administrator account compromise.
- How severe is CVE-2026-23921?
- CVE-2026-23921 has a CVSS 4.0 base score of 8.7, rated high severity.
- Is CVE-2026-23921 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-23921?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-23921 have an EU (EUVD) identifier?
- Yes. CVE-2026-23921 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14955.
- When was CVE-2026-23921 published?
- CVE-2026-23921 was published on 2026-03-24 and last updated on 2026-06-17.
References
Other CWE-89 (SQL Injection) vulnerabilities
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