CVE-2022-23134
CVE-2022-23134 is a security flaw in Zabbix Frontend. Attackers can reach parts of Zabbix Frontend that should be locked to them from anywhere, without logging in. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 22 Feb 2022.[1]
Zabbix Frontend is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Zabbix has published a fix or advice.
Description
CISA calls it an improper access control in Zabbix Frontend. In its words: “Malicious actors can pass step checks and potentially change the configuration of Zabbix Frontend.”[1]
The CVE record adds: “After the initial setup process, some steps of setup.php file are reachable not only by super-administrators, but by unauthenticated users as well. Malicious actor can pass step checks and potentially change the configuration of Zabbix Frontend.”[2]
The underlying weakness is improper access control (CWE-284), in MITRE’s list of common software weaknesses.
It scores 5.3 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; Zabbix’s advisory has them[3]. CISA names the product as Zabbix Frontend.
Most families won’t have Zabbix Frontend; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 22 Feb 2022, 40 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 8 Mar 2022 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 95%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Zabbix has published a fix or advice.[3] CISA’s required action: “Apply updates per vendor instructions.”[1]
- Check whether you use it.Zabbix Frontend is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 8 Mar 2022 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 5.3.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 95%.[4] |
See also
Other Zabbix Frontend flaws
- CVE-2022-23131: authentication bypass ·
Other improper access control flaws
- CVE-2015-3306, ProFTPD: improper access control ·
- CVE-2026-21962, Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in: improper access control ·
- CVE-2026-56290, Joomlack Page Builder: improper access control ·
- CVE-2026-34908, Ubiquiti UniFi OS: improper access control ·
- CVE-2026-48907, Widget Factory Joomla Content Editor: improper access control ·
Added the same day
- CVE-2022-23131, Zabbix Frontend: authentication bypass ·
References
- ^ Cybersecurity and Infrastructure Security Agency. “Zabbix Frontend Improper Access Control Vulnerability”. Known Exploited Vulnerabilities Catalog, added 22 Feb 2022.
- ^ National Institute of Standards and Technology. “CVE-2022-23134 Detail”. National Vulnerability Database, published 13 Jan 2022.
- ^ Zabbix. Advisories and fixes: lists.fedoraproject.org, lists.fedoraproject.org, support.zabbix.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.953, percentile 99.9, 31 Oct 2026.
- CVE Program. “CVE-2022-23134”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.