CVE-2025-57543: Cross Site scripting vulnerability (XSS) in NetBox 4.3.5 "comment" field on object forms

Routine

MEDIUM 6.1DOWNGRADE

CVE-2025-57543 is a medium-severity flaw (CVSS 6.1) affecting netbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site scripting vulnerability (XSS) in NetBox 4.3.5 "comment" field on object forms. An attacker can inject arbitrary HTML, which will be rendered in the web UI when viewed by other users. This could potentially lead to user interface redress attacks or be escalated to XSS in certain contexts.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netbox

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-16 16:16 UTCPublished CVE record published
2026-06-17 09:43 UTCUpdated Record last modified

netbox netbox DOWNGRADE

Affected: 4.3.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.5

1. Check installed version

apt-cache policy netbox || rpm -q netbox || netbox --version

2. No fixed release: DOWNGRADE to a release before 4.3.5 (Debian / Ubuntu)

apt-cache madison netbox sudo apt install netbox=<VERSION_BEFORE_4.3.5> sudo apt-mark hold netbox

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list netbox sudo dnf downgrade netbox-<VERSION_BEFORE_4.3.5> sudo dnf versionlock add netbox

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-57543?

netbox: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-57543 being exploited?

CVE-2025-57543 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-57543 affect?

CVE-2025-57543 affects netbox. Severity is medium (CVSS 6.1). Cross Site scripting vulnerability (XSS) in NetBox 4.3.5 "comment" field on object forms. An attacker can inject arbitrary HTML, which will be rendered in the web UI when viewed by other users. This could potentially lead to user interface

How urgent is CVE-2025-57543?

Priority 28/100. Public exploit reference

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References

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