CVE-2020-4707Network attack vector

Trusted-session JavaScript execution via unsanitized Web UI input

Published Aug 4, 2021 · Updated Sep 16, 2024

Cross-site scripting in IBM API Connect 5.0.0.0 through 5.0.8.11 allows remote authenticated users to execute JavaScript. The Web UI renders user-supplied input without sufficient neutralization, causing injected JavaScript to run in another user's trusted session. Exploitation requires low-privileged access and interaction by a session holder; documented consequences are altered Web UI behavior and credential disclosure.

CVSS severity5.4
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in IBM API Connect 5.0.0.0 through 5.0.8.11 allows remote authenticated users to execute JavaScript. The Web UI renders user-supplied input without sufficient neutralization, causing injected JavaScript to run in another user's trusted session. Exploitation requires low-privileged access and interaction by a session holder; documented consequences are altered Web UI behavior and credential disclosure.

The record

CVE
CVE-2020-4707
Published
Aug 4, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
API Connect
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.0.0.0
  2. Affected versionversion=5.0.8.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · API Connectversion=5.0.0.0; version=5.0.8.11

Published CVSS scores

5.4IBM CorporationCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV: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 exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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