CVE-2020-9520Public exploitNetwork attack vector

Stored XSS via malformed uploaded-file titles

Published Mar 25, 2020 · Updated Aug 4, 2024

Stored XSS in Micro Focus Vibe before 4.0.7 allows remote authenticated users to execute JavaScript when another user views a crafted file page. Server-side sanitization leaves an unclosed image tag in an uploaded file title unchanged, and client-side markup repair converts its onerror text into an executable attribute. Exploitation requires an authenticated attacker to upload the titled file and an authenticated victim to visit its page, where the script runs in the victim's browser context.

CVSS severity5.4
Medium
EPSS probability0.81%
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 Micro Focus Vibe before 4.0.7 allows remote authenticated users to execute JavaScript when another user views a crafted file page. Server-side sanitization leaves an unclosed image tag in an uploaded file title unchanged, and client-side markup repair converts its onerror text into an executable attribute. Exploitation requires an authenticated attacker to upload the titled file and an authenticated victim to visit its page, where the script runs in the victim's browser context.

The record

CVE
CVE-2020-9520
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
Micro Focus
Product
Vibe
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 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?

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

  1. Affected versionversion=All Vibe version prior to Vive 4.0.7.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Micro Focus · Vibeversion=All Vibe version prior to Vive 4.0.7.

Published CVSS scores

5.5Micro FocusAV:N/AC:L/Au:S/C:P/I:P/A:N
5.4Micro FocusCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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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