CVE-2020-5223Public exploitNetwork attack vector

Stored XSS via unescaped attachment filename

Published Jan 23, 2020 · Updated Aug 4, 2024

Stored XSS in PrivateBin 1.2.0 through 1.2.1 and 1.3.0 through 1.3.1 allows attackers to run script in visitors' browsers. AttachmentViewer.moveAttachmentTo passes the attacker-controlled download filename to I18n._ as HTML instead of encoding it as text. Exploitation requires file uploads, ineffective CSP enforcement, a malicious paste, and a visitor clicking Clone; the impact is limited to that paste's browser context.

CVSS severity4.4
Medium
EPSS probability0.66%
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 PrivateBin 1.2.0 through 1.2.1 and 1.3.0 through 1.3.1 allows attackers to run script in visitors' browsers. AttachmentViewer.moveAttachmentTo passes the attacker-controlled download filename to I18n._ as HTML instead of encoding it as text. Exploitation requires file uploads, ineffective CSP enforcement, a malicious paste, and a visitor clicking Clone; the impact is limited to that paste's browser context.

The record

CVE
CVE-2020-5223
Published
Jan 23, 2020
Updated
Aug 4, 2024
Vendor
PrivateBin
Product
PrivateBin
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 1.2.0, < 1.2.2
  2. Affected versionversion=>= 1.3.0, < 1.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PrivateBin · PrivateBinversion=>= 1.2.0, < 1.2.2; version=>= 1.3.0, < 1.3.2

Published CVSS scores

4.4NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
2.1NIST NVDAV:N/AC:H/Au:S/C:N/I:P/A:N
6.1GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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