CVE-2021-3124: Stored cross-site scripting (XSS) in form field in robust.systems product Custom Global Variables v 1.0.5 allo

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-3124 is a medium-severity flaw (CVSS 5.4) affecting custom global variables. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stored cross-site scripting (XSS) in form field in robust.systems product Custom Global Variables v 1.0.5 allows a remote attacker to inject arbitrary code via the vars[0][name] field.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-02-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: newtarget

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

Am I affected?

Timeline

2021-02-25 15:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

newtarget custom global variables DOWNGRADE

Affected: 1.0.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.5

1. Check installed version

apt-cache policy custom-global-variables || rpm -q custom-global-variables || custom-global-variables --version

2. No fixed release: DOWNGRADE to a release before 1.0.5 (Debian / Ubuntu)

apt-cache madison custom-global-variables sudo apt install custom-global-variables=<VERSION_BEFORE_1.0.5> sudo apt-mark hold custom-global-variables

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

dnf --showduplicates list custom-global-variables sudo dnf downgrade custom-global-variables-<VERSION_BEFORE_1.0.5> sudo dnf versionlock add custom-global-variables

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-2021-3124?

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

Is CVE-2021-3124 being exploited?

CVE-2021-3124 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-2021-3124 affect?

CVE-2021-3124 affects custom global variables. Severity is medium (CVSS 5.4). Stored cross-site scripting (XSS) in form field in robust.systems product Custom Global Variables v 1.0.5 allows a remote attacker to inject arbitrary code via the vars[0][name] field.

How urgent is CVE-2021-3124?

Priority 39/100. Public exploit reference

References

← Back to latest CVEs