CVE-2021-27520

Fudforum vulnerability

CVSS

6.1

EPSS

6.4%

EPSS pct

93th

Exploited

No known

A cross-site scripting (XSS) issue in FUDForum 3.1.0 allows remote attackers to inject JavaScript via index.php in the "author" parameter.

Affected vendor

Fudforum

Affected product

Fudforum

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness type (CWE)

CWE-79 — Cross-Site Scripting (XSS)

Published

2021-03-19

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity.

Its EPSS score of 6.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2021-27520

Confirm whether Fudforum Fudforum is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-27520.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-27520

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-27520 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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