CVE-2021-38338Network attack vector

Reflected XSS via unescaped font preview parameters

Published Sep 10, 2021 · Updated May 2, 2025

Reflected XSS in Ospisoft Border Loading Bar 1.0.1 and earlier allows remote attackers to run scripts via crafted f or t parameters. The iframe-googlefont-preview.php endpoint inserts the f and t query values into its HTML response without output encoding. Exploitation requires a victim to follow a crafted URL; the script then runs in the affected site's browser origin and can read or alter page data.

CVSS severity6.1
Medium
EPSS probability0.90%
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 Ospisoft Border Loading Bar 1.0.1 and earlier allows remote attackers to run scripts via crafted f or t parameters. The iframe-googlefont-preview.php endpoint inserts the f and t query values into its HTML response without output encoding. Exploitation requires a victim to follow a crafted URL; the script then runs in the affected site's browser origin and can read or alter page data.

The record

CVE
CVE-2021-38338
Published
Sep 10, 2021
Updated
May 2, 2025
Vendor
Ospisoft
Product
Border Loading Bar
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2021CVE publishedPublication date reported by the CVE source.
  2. May 2, 2025Record 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=1.0.1 <=1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ospisoft · Border Loading Barversion=1.0.1 <=1.0.1

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1189Drive-by Compromise

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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