CVE-2026-45011Public exploitNetwork attack vector

Stored XSS via executable image-widget links

Published Jun 12, 2026 · Updated Jun 12, 2026

Stored XSS in ApostropheCMS 4.29.0 allows remote authenticated users to execute JavaScript when victims click a crafted image link. The image widget accepts and publishes a javascript: URL in its Link to field without rejecting the executable scheme. Editor access and a victim click are required; Contributors can plant the payload in drafts, while Editors can expose administrators or visitors on live pages.

CVSS severity7.3
High
EPSS probability0.21%
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 ApostropheCMS 4.29.0 allows remote authenticated users to execute JavaScript when victims click a crafted image link. The image widget accepts and publishes a javascript: URL in its Link to field without rejecting the executable scheme. Editor access and a victim click are required; Contributors can plant the payload in drafts, while Editors can expose administrators or visitors on live pages.

The record

CVE
CVE-2026-45011
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Apostrophe Technologies
Product
ApostropheCMS
Classifications
CWE-116, CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 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== 4.29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Apostrophe Technologies · ApostropheCMSversion== 4.29.0

Published CVSS scores

7.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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