CVE-2021-28006: Web Based Quiz System 1.0 is affected by cross-site scripting (XSS) in admin.php through the options parameter

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MEDIUM 6.1DOWNGRADE

CVE-2021-28006 is a medium-severity flaw (CVSS 6.1) affecting web based quiz system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Web Based Quiz System 1.0 is affected by cross-site scripting (XSS) in admin.php through the options parameter.

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	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-03-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: web based quiz system project

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

Am I affected?

Timeline

2021-03-09 14:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

web based quiz system project web based quiz system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy web-based-quiz-system || rpm -q web-based-quiz-system || web-based-quiz-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison web-based-quiz-system sudo apt install web-based-quiz-system=<VERSION_BEFORE_1.0> sudo apt-mark hold web-based-quiz-system

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

dnf --showduplicates list web-based-quiz-system sudo dnf downgrade web-based-quiz-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add web-based-quiz-system

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-2021-28006?

web based quiz system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-28006 being exploited?

CVE-2021-28006 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-2021-28006 affect?

CVE-2021-28006 affects web based quiz system. Severity is medium (CVSS 6.1). Web Based Quiz System 1.0 is affected by cross-site scripting (XSS) in admin.php through the options parameter.

How urgent is CVE-2021-28006?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2022-44411 HIGH 7.5 DOWNGRADE Web Based Quiz System v1.0 transmits user passwords in plaintext during the authentication process, allowing a
CVE-2022-35422 CRITICAL 9.8 DOWNGRADE Web Based Quiz System v1.0 was discovered to contain a SQL injection vulnerability via the qid parameter at up
CVE-2022-32991 HIGH 8.8 DOWNGRADE Web Based Quiz System v1.0 was discovered to contain a SQL injection vulnerability via the eid parameter at we
CVE-2021-28007 MEDIUM 6.1 DOWNGRADE Web Based Quiz System 1.0 is affected by cross-site scripting (XSS) in register.php through the name parameter

References

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