How severe is CVE-2021-30083?

CVE-2021-30083 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-30083 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30083?

CVE-2021-30083 affects Webfairy Mediat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30083?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-30083 published?

CVE-2021-30083 was published on 2021-05-24 and last updated on 2026-06-17.

CVE-2021-30083

CVE-2021-30083 is a medium-severity vulnerability in Webfairy Mediat with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Webfairy Mediat
Published: 2021-05-24
Last modified: 2026-06-17

Description

An issue was discovered in Mediat 1.4.1. There is a Reflected XSS vulnerability which allows remote attackers to inject arbitrary web script or HTML without authentication via the 'return' parameter in login.php.

Frequently asked questions

What is CVE-2021-30083?: An issue was discovered in Mediat 1.4.1. There is a Reflected XSS vulnerability which allows remote attackers to inject arbitrary web script or HTML without authentication via the 'return' parameter in login.php.
How severe is CVE-2021-30083?: CVE-2021-30083 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-30083 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30083?: CVE-2021-30083 affects Webfairy Mediat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30083?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-30083 published?: CVE-2021-30083 was published on 2021-05-24 and last updated on 2026-06-17.

References

https://github.com/WebFairyNet/Mediat/issues/3

Affected products (1)

cpe:2.3:a:webfairy:mediat:1.4.1:*:*:*:*:*:*:*

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →