IBM API Connect 2018.1 and 2018.4.1.2 apis can be leveraged by unauthenticated users to discover login ids of registered users.

published 2019-03-22 7y ago modified 2026-06-17 4mo ago also EUVD-2019-13659

cvss: 8.2; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits: 0; none known

IBM API Connect 2018.1 and 2018.4.1.2 apis can be leveraged by unauthenticated users to discover login ids of registered users. IBM X-Force ID: 156544.

Patch / fix

links 1

ibm.com/support/docview.wss?uid=ibm10874248 advisory

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Exploit prediction

1.91% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.2	CVSS:3.0/C:H/I:L/S:U/AV:N/PR:N/AC:L/UI:N/A:N/RC:C/RL:O/E:U
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	3.0	8.2	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

IBM API Connect

References

ibm.com /support/docview.wss?uid=ibm10874248
patch, vendor-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/156544
vdb-entry, broken-link, vendor-advisory
securityfocus.com /bid/107559
vdb-entry, third-party-advisory

Sources

CVE List CVE-2019-4052
NVD CVE-2019-4052

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