CVE-2021-20562Public exploitNetwork attack vector

Credential disclosure via reflected securetoken injection

Published Jul 27, 2021 · Updated Sep 16, 2024

Reflected XSS in the mailbox UI of IBM Sterling B2B Integrator allows remote authenticated users to disclose credentials through crafted URLs. The securetoken parameter is returned without adequate neutralization by MBIList.jsp, MBISearch.jsp, and MBISend.jsp, causing supplied script to execute in the mailbox origin. Exploitation requires a valid SCI_DLSSO cookie, an absent or invalid mailbox JSESSIONID cookie, and a victim who opens an attacker-prepared URL.

CVSS severity5.4
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in the mailbox UI of IBM Sterling B2B Integrator allows remote authenticated users to disclose credentials through crafted URLs. The securetoken parameter is returned without adequate neutralization by MBIList.jsp, MBISearch.jsp, and MBISend.jsp, causing supplied script to execute in the mailbox origin. Exploitation requires a valid SCI_DLSSO cookie, an absent or invalid mailbox JSESSIONID cookie, and a victim who opens an attacker-prepared URL.

The record

CVE
CVE-2021-20562
Published
Jul 27, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Sterling B2B Integrator
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 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=5.2.0.0
  2. Affected versionversion=5.2.6.5_3
  3. Affected versionversion=6.1.0.0
  4. Affected versionversion=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; version=5.2.6.5_3; version=6.1.0.0; version=6.1.0.2

Published CVSS scores

5.4IBM CorporationCVSS:3.0/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
5.4NIST NVDCVSS: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 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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