CVE-2021-30083Network attack vector

Unauthenticated browser script execution via reflected return parameter

Published May 24, 2021 · Updated Aug 3, 2024

Reflected XSS in WebFairy Mediat 1.4.1 allows remote attackers to inject script or HTML through login.php's unauthenticated return parameter. Public records identify the input and endpoint but do not disclose the precise output context or encoding operation that reflects the value. Exploitation requires a user to load an attacker-crafted request; successful script runs in that user's browser under the Mediat origin, allowing accessible page content or session data to be read or altered.

CVSS severity6.1
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in WebFairy Mediat 1.4.1 allows remote attackers to inject script or HTML through login.php's unauthenticated return parameter. Public records identify the input and endpoint but do not disclose the precise output context or encoding operation that reflects the value. Exploitation requires a user to load an attacker-crafted request; successful script runs in that user's browser under the Mediat origin, allowing accessible page content or session data to be read or altered.

The record

CVE
CVE-2021-30083
Published
May 24, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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