High · CVSS 7.1CVE-2026-71553GHSA-VMG4-6GFG-83QX

ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS

Answer in brief

CVE-2026-71553 records a High severity (CVSS 7.1) vulnerability in ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS. The current sources do not mark it as known exploited. The current feed maps apostrophecms/apostrophe (generic), apostrophe (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 17, 2026Updated Sep 14, 2026Source checked Oct 1, 2026First seen by HOL Aug 17, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps apostrophecms/apostrophe (generic), apostrophe (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
apostrophecms/apostrophegeneric	<= 4.32.0	Not reported
apostrophenpm	<=4.32.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for apostrophecms/apostrophe, apostrophe.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 17, 2026

Sources and claim methodology

Upstream source description

ApostropheCMS is an open-source Node.js content management system. In 4.32.0 and earlier, PATCH /api/v1/article/:id accepts the inherited path toString.call and passes it through the utility module to apos.util.set() and apos.util.get(), allowing an authenticated editor to overwrite the shared Object.prototype.toString function's call property and cause a persistent process-wide denial of service until restart.

Quoted source text, attributed separately from HOL analysis.