CVE-2021-28588Network attack vector

Remote code execution via unvalidated folderId paths

Published Jun 28, 2021 · Updated Sep 16, 2024

Path traversal in Adobe RoboHelp Server 2019.0.9 and earlier allows remote attackers to execute code through a crafted HTTP POST request. The server uses the user-supplied folderId path in file operations without validating that it remains within the intended directory. Existing authentication can be bypassed, after which code runs in the current service user's context without further user interaction.

CVSS severity8.8
High
EPSS probability6.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Adobe RoboHelp Server 2019.0.9 and earlier allows remote attackers to execute code through a crafted HTTP POST request. The server uses the user-supplied folderId path in file operations without validating that it remains within the intended directory. Existing authentication can be bypassed, after which code runs in the current service user's context without further user interaction.

The record

CVE
CVE-2021-28588
Published
Jun 28, 2021
Updated
Sep 16, 2024
Vendor
Adobe
Product
Adobe RoboHelp Server
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 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=unspecified <=2019.0.9
  2. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adobe · Adobe RoboHelp Serverversion=unspecified <=2019.0.9; version=unspecified <=None

Published CVSS scores

8.8AdobeCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8Trend Micro Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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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