CVE-2017-20089Public exploitNetwork attack vector

Administrator session theft via unescaped author origin

Published Jun 23, 2022 · Updated Apr 15, 2025

Stored XSS in Gwolle Guestbook 1.7.4 allows remote attackers to execute script in an editor's or administrator's browser. The author-origin field is stored from a guestbook submission, and admin/page-editor.php places it in a value attribute without sufficient output encoding. Execution occurs when an editor or administrator reviews the entry, enabling session-token theft or actions with that user's privileges.

CVSS severity3.5
Low
EPSS probability0.73%
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 Gwolle Guestbook 1.7.4 allows remote attackers to execute script in an editor's or administrator's browser. The author-origin field is stored from a guestbook submission, and admin/page-editor.php places it in a value attribute without sufficient output encoding. Execution occurs when an editor or administrator reviews the entry, enabling session-token theft or actions with that user's privileges.

The record

CVE
CVE-2017-20089
Published
Jun 23, 2022
Updated
Apr 15, 2025
Vendor
Marcel Pol
Product
Gwolle Guestbook
Classifications
CWE-80, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=1.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marcel Pol · Gwolle Guestbookversion=1.7.4

Published CVSS scores

3.5VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/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

CWE-80Basic Cross Site Scripting
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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