CVE-2021-20553Network attack vector

Credential disclosure via stored Web UI script injection

Published Dec 18, 2024 · Updated Dec 19, 2024

Stored cross-site scripting in IBM Sterling B2B Integrator 5.2.0.0 through 6.1.1.0 allows remote authenticated users to read credentials. The Web UI stores attacker-supplied JavaScript and later executes it in another user's trusted browser session; IBM has not disclosed the affected field or missing neutralization step. Low-privileged access is required to place the script, and a victim must view the affected UI content before credentials are exposed.

CVSS severity5.4
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in IBM Sterling B2B Integrator 5.2.0.0 through 6.1.1.0 allows remote authenticated users to read credentials. The Web UI stores attacker-supplied JavaScript and later executes it in another user's trusted browser session; IBM has not disclosed the affected field or missing neutralization step. Low-privileged access is required to place the script, and a victim must view the affected UI content before credentials are exposed.

The record

CVE
CVE-2021-20553
Published
Dec 18, 2024
Updated
Dec 19, 2024
Vendor
IBM
Product
IBM Sterling B2B Integrator
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 19, 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=5.2.0.0 <=5.2.6.5
  2. Affected versionversion=6.0.0.0 <=6.0.0.6
  3. Affected versionversion=6.0.1.0 <=6.0.3.4
  4. Affected versionversion=6.1.0.0 <=6.1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Sterling B2B Integratorversion=5.2.0.0 <=5.2.6.5; version=6.0.0.0 <=6.0.0.6; version=6.0.1.0 <=6.0.3.4; version=6.1.0.0 <=6.1.0.2

Published CVSS scores

5.4IBM CorporationCVSS:3.1/AV:N/AC:L/PR:L/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 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')
T1203Exploitation for Client Execution

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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