CVE-2026-23921
A public proof of concept exists; no exploitation attested.
- Published2026-03-24
- Fixed in7.4.6 · 7.2.15 · 7.0.22
- WeaknessCWE-89
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2026-03-2419:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-27 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-23921?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-23921?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.4 | ≥ 7.4.0, < 7.4.6 | 7.4.6 | NVD |
| 7.2 | ≥ 7.2.0, < 7.2.15 | 7.2.15 | NVD |
| 7.0 | ≥ 7.0.0, < 7.0.22 | 7.0.22 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
- CVE-2026-23921 Red Hat Product Security
Zabbix: Zabbix: Arbitrary database data exfiltration and administrator account compromise via blind SQL injection in API
Fix
- Update Zabbix to 7.4.6 · 7.2.15 · 7.0.22
Advisories and patches
- support.zabbix.comVendor Advisory
Detection
read 2026-10-27 00:21 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 2 repositories, unverifiedRichJJ98/analise-vulnerabilidades-zabbix-notebooklmqucklecrabik/CVE-2026-23921 PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2026-03-25
- OpenCVESSVC decisionnone—
- CNACVSS 4.08.7read 2026-10-23
- NVDCVSS 3.18.8read 2026-10-23
- CNAweakness (CWE)CWE-89read 2026-10-23
- FIRST EPSSEPSS score4.1 %2026-10-26
- PoC-in-GitHubproof of concept2read 2026-10-27
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published
- 2026-03-24
- Last Modified
- 2026-09-10
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-23921?
Is CVE-2026-23921 actively exploited?
What is the CVSS score for CVE-2026-23921?
Running Zabbix? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.