CVE-2021-28579Network attack vector

Participant-list disclosure via improper access control

Published Jun 28, 2021 · Updated Apr 23, 2025

Improper access control in Adobe Connect 11.2.1 and earlier allows remote authenticated users to view event participant lists. Adobe identifies the affected locus only as access controls governing event participant lists and does not disclose the faulty authorization operation. Learner permissions are required, and the bounded impact is disclosure of participant information within the victim's browser context.

CVSS severity4.3
Medium
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Adobe Connect 11.2.1 and earlier allows remote authenticated users to view event participant lists. Adobe identifies the affected locus only as access controls governing event participant lists and does not disclose the faulty authorization operation. Learner permissions are required, and the bounded impact is disclosure of participant information within the victim's browser context.

The record

CVE
CVE-2021-28579
Published
Jun 28, 2021
Updated
Apr 23, 2025
Vendor
Adobe
Product
Adobe Connect
Classifications
CWE-284, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=unspecified <=11.2.1
  2. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Adobe · Adobe Connectversion=unspecified <=11.2.1; version=unspecified <=None

Published CVSS scores

4.3Adobe Systems IncorporatedCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/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.

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-284Improper Access Control
T1087Account Discovery

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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