CVE-2026-54543 Froxlor DomainZones.add allows DNS zone-file RR injection via record/type fields
Authenticated users can inject malicious DNS records into zone files via the DomainZones.add API, allowing unauthorized DNS data modification and potential service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54543?
CVE-2026-54543 is a medium-severity vulnerability in froxlor, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Froxlor is open source server administration software. Prior to 2.3.8, the DomainZones.add API command in lib/Froxlor/Api/Commands/DomainZones.php accepts user-controlled record and type values without rejecting line delimiters, tab characters, semicolons, or unsupported DNS record types before lib/Froxlor/Dns/DnsEntry.php serializes the values into a BIND zone file. An authenticated customer with DNS-zone permissions can place a crafted value in the record field, or use the related type-field variant, to create additional resource-record lines that bypass Froxlor's field-level validation. BIND accepts the injected records, allowing modification of DNS data and possible DNS availability impact within a zone the caller is authorized to manage. This issue is fixed in version 2.3.8.
Weakness: CWE-74
Which versions are affected by CVE-2026-54543?
2 open source packages ship an affected version, including froxlor/froxlor.
| Package | Affected | Fixed in |
|---|---|---|
froxlor/froxlor Packagist | All versions | 2.3.8 |
froxlor/froxlor Packagist | All versions | 2.3.8 |
How do I fix CVE-2026-54543?
Upgrade froxlor/froxlor to 2.3.8 or later.
Is CVE-2026-54543 being exploited?
There is no known exploitation of CVE-2026-54543 in the wild and no public exploit code.
Sources
Also known as GHSA-5rw4-4665-cvwf.