CVE-2020-29021Public exploitNetwork attack vector

Stored XSS via unsanitized public web content

Published Feb 8, 2021 · Updated Sep 17, 2024

Stored XSS in Secomea GateManager before 9.3 allows remote authenticated users to execute JavaScript in another user's browser. Public-file uploads accept active content without extension controls, while Terms of Use input is stored and rendered without validation. Server-operator privileges are required to plant the content, and a visitor must open it, exposing cookies or triggering actions in that visitor's session.

CVSS severity4.8
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Secomea GateManager before 9.3 allows remote authenticated users to execute JavaScript in another user's browser. Public-file uploads accept active content without extension controls, while Terms of Use input is stored and rendered without validation. Server-operator privileges are required to plant the content, and a visitor must open it, exposing cookies or triggering actions in that visitor's session.

The record

CVE
CVE-2020-29021
Published
Feb 8, 2021
Updated
Sep 17, 2024
Vendor
Secomea
Product
GateManager
Classifications
CWE-79, CWE-20, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=all <9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Secomea · GateManagerversion=all <9.3

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.8TenableCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
3.5Secomea A/SCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
6.3TenableCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

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')
CWE-20Improper Input Validation
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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