CVE-2017-20036Public exploitNetwork attack vector

Stored XSS via unencoded bounce-rule expression

Published Jun 10, 2022 · Updated Apr 15, 2025

Stored XSS in phpList 3.2.6 Bounce Rules allows remote authenticated users to execute script in another administrator's browser. The administration interface stores the bounce-rule expression parameter and renders it in the rule overview without output encoding. An account permitted to edit bounce rules must save the payload, and another user must open the overview; execution occurs in that viewer's browser context.

CVSS severity3.5
Low
EPSS probability0.60%
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 phpList 3.2.6 Bounce Rules allows remote authenticated users to execute script in another administrator's browser. The administration interface stores the bounce-rule expression parameter and renders it in the rule overview without output encoding. An account permitted to edit bounce rules must save the payload, and another user must open the overview; execution occurs in that viewer's browser context.

The record

CVE
CVE-2017-20036
Published
Jun 10, 2022
Updated
Apr 15, 2025
Vendor
phpList
Product
phpList
Classifications
CWE-79, CWE-80, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 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=3.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

phpList · phpListversion=3.2.6

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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 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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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