CVE-2020-13248Public exploitNetwork attack vector

Browser-session compromise via unsanitized stored avatar

Published Jun 24, 2020 · Updated Aug 4, 2024

Stored XSS in BooleBox Secure File Sharing Utility before 4.2.3.0 allows remote authenticated users to run JavaScript in other users' sessions. Account.aspx accepts an avatar value that is not valid base64 image data, stores it with minimal or no sanitization, and later inserts it into an img element's src attribute. A basic account can plant the payload; execution occurs when another user opens the attacker's profile or contact entry, exposing that user's session data and actions.

CVSS severity5.4
Medium
EPSS probability0.58%
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 BooleBox Secure File Sharing Utility before 4.2.3.0 allows remote authenticated users to run JavaScript in other users' sessions. Account.aspx accepts an avatar value that is not valid base64 image data, stores it with minimal or no sanitization, and later inserts it into an img element's src attribute. A basic account can plant the payload; execution occurs when another user opens the attacker's profile or contact entry, exposing that user's session data and actions.

The record

CVE
CVE-2020-13248
Published
Jun 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/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
Privilegesauthenticated
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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