CVE-2026-71553Public exploitNetwork attack vector

Persistent denial of service via inherited path traversal

Published Aug 17, 2026 · Updated Aug 17, 2026

Prototype pollution in ApostropheCMS 4.32.0 and earlier allows remote authenticated users to halt the site through a PATCH request. The PATCH handler passes the inherited path toString.call to apos.util.get() and apos.util.set(), which traverse Object.prototype and overwrite the shared function's call property. Editor access is required, and one request breaks later process-wide toString calls until the Node.js process restarts.

CVSS severity7.1
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in ApostropheCMS 4.32.0 and earlier allows remote authenticated users to halt the site through a PATCH request. The PATCH handler passes the inherited path toString.call to apos.util.get() and apos.util.set(), which traverse Object.prototype and overwrite the shared function's call property. Editor access is required, and one request breaks later process-wide toString calls until the Node.js process restarts.

The record

CVE
CVE-2026-71553
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
ApostropheCMS
Product
ApostropheCMS
Classifications
CWE-1321, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 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=<= 4.32.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ApostropheCMS · ApostropheCMSversion=<= 4.32.0

Published CVSS scores

7.1SnykCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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