CVE-2023-29489Public exploitNetwork attack vector

Reflected XSS via unescaped invalid webcall ID

Published Apr 27, 2023 · Updated Aug 2, 2024

Reflected XSS in the cpsrvd error page in WebPros cPanel before 11.109.9999.116 allows remote attackers to run script via a crafted link. The error handler inserts an attacker-controlled invalid webcall ID into its HTML response without escaping the value. A victim must follow the link; the script then runs in the cPanel origin and can read or modify browser-accessible session data.

CVSS severity6.1
Medium
EPSS probability65.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in the cpsrvd error page in WebPros cPanel before 11.109.9999.116 allows remote attackers to run script via a crafted link. The error handler inserts an attacker-controlled invalid webcall ID into its HTML response without escaping the value. A victim must follow the link; the script then runs in the cPanel origin and can read or modify browser-accessible session data.

The record

CVE
CVE-2023-29489
Published
Apr 27, 2023
Updated
Aug 2, 2024
Vendor
WebPros
Product
cPanel
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=0 <11.109.9999.116

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WebPros · cPanelversion=0 <11.109.9999.116

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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