CVE-2021-24995Public exploitNetwork attack vector

Stored XSS via unsanitized answer text size

Published Mar 14, 2022 · Updated Aug 3, 2024

Stored XSS in a.ankit's HTML5 Responsive FAQ 2.8.5 and earlier allows remote authenticated users to inject scripts via a plugin setting. The answer-text-size setting accepts a closing style tag and script markup without sanitizing or escaping it, then emits the value in the site footer on every frontend page. Administrator-level access is required to store the payload, and script execution requires another user to visit a frontend page.

CVSS severity4.8
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in a.ankit's HTML5 Responsive FAQ 2.8.5 and earlier allows remote authenticated users to inject scripts via a plugin setting. The answer-text-size setting accepts a closing style tag and script markup without sanitizing or escaping it, then emits the value in the site footer on every frontend page. Administrator-level access is required to store the payload, and script execution requires another user to visit a frontend page.

The record

CVE
CVE-2021-24995
Published
Mar 14, 2022
Updated
Aug 3, 2024
Vendor
a.ankit
Product
HTML5 Responsive FAQ
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 14, 2022CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.8.5 <=2.8.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

a.ankit · HTML5 Responsive FAQversion=2.8.5 <=2.8.5

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
5.5WordfenceCVSS:3.1/AV:N/AC:L/PR:H/UI:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

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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