CVE-2026-46511Public exploitNetwork attack vector

Cross-tenant account hijacking via stored XSS token theft

Published Jun 5, 2026 · Updated Jun 5, 2026

Stored XSS in HAXcms NodeJS and PHP before 26.0.0 allows remote authenticated users to steal tokens and hijack accounts. The /system/api/connectionSettings endpoint serializes the active session's JWT, user, site, and app-store tokens into window.appSettings, where injected script fetches and exfiltrates them. Edit access to any site and a victim viewing the compromised page are required; the stolen tokens enable cross-tenant impersonation and administrative actions.

CVSS severity8.7
High
EPSS probability0.27%
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 HAXcms NodeJS and PHP before 26.0.0 allows remote authenticated users to steal tokens and hijack accounts. The /system/api/connectionSettings endpoint serializes the active session's JWT, user, site, and app-store tokens into window.appSettings, where injected script fetches and exfiltrates them. Edit access to any site and a victim viewing the compromised page are required; the stolen tokens enable cross-tenant impersonation and administrative actions.

The record

CVE
CVE-2026-46511
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
HAXTheWeb
Product
HAXcms (PHP)
Classifications
CWE-522, CWE-79, CWE-922, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record 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=< 26.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HAXTheWeb · HAXcms (PHP)version=< 26.0.0
HAXTheWeb · HAXcms (NodeJS)version=< 26.0.0

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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 exploitPublished

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-922Insecure Storage of Sensitive Information
T1528Steal Application Access Token

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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