CVE-2017-20191Network attack vector

Persistent XSS via unencoded form error message

Published Mar 31, 2024 · Updated Aug 5, 2024

Persistent XSS in Zimbra zm-admin-ajax 8.8.0 through 8.8.1 allows remote authenticated users to execute script via form error text. XFormItem.prototype.setError assigns the message argument directly to an error container's innerHTML without HTML encoding. A logged-in attacker must supply the stored error text and a user must load the affected form, allowing script execution in that user's browser context.

CVSS severity3.5
Low
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Persistent XSS in Zimbra zm-admin-ajax 8.8.0 through 8.8.1 allows remote authenticated users to execute script via form error text. XFormItem.prototype.setError assigns the message argument directly to an error container's innerHTML without HTML encoding. A logged-in attacker must supply the stored error text and a user must load the affected form, allowing script execution in that user's browser context.

The record

CVE
CVE-2017-20191
Published
Mar 31, 2024
Updated
Aug 5, 2024
Vendor
Zimbra
Product
zm-admin-ajax
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=8.8.0
  2. Affected versionversion=8.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zimbra · zm-admin-ajaxversion=8.8.0; version=8.8.1

Published CVSS scores

3.5VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:P/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-79Cross Site Scripting
T1203Exploitation for Client Execution

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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