CVE-2022-28987Public exploitNetwork attack vector

Unauthenticated username enumeration via login API

Published May 20, 2022 · Updated Aug 3, 2024

Authentication weakness in Zoho ManageEngine ADSelfService Plus before 6202 allows remote attackers to identify valid usernames via a crafted POST request. The /ServletAPI/accounts/login endpoint returns distinguishable responses when supplied with crafted login data, exposing whether an account exists. The request is unauthenticated and the disclosed information supports account discovery, but no direct account modification or service interruption is described.

CVSS severity5.3
Medium
EPSS probability10.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication weakness in Zoho ManageEngine ADSelfService Plus before 6202 allows remote attackers to identify valid usernames via a crafted POST request. The /ServletAPI/accounts/login endpoint returns distinguishable responses when supplied with crafted login data, exposing whether an account exists. The request is unauthenticated and the disclosed information supports account discovery, but no direct account modification or service interruption is described.

The record

CVE
CVE-2022-28987
Published
May 20, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1087.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NVDAV:N/AC:L/Au:N/C:P/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1087.002Account Discovery: Domain Account

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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