What’s Vulnerable › Vulnerabilities

CVE-2026-71553: ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-17 · updated 2026-10-23
• Weakness: CWE-1321

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.

Affected products

• apostrophecms apostrophe: through 4.32.0

References

• https://github.com/apostrophecms/apostrophe/commit/5a3746aaed49761e171c2cbfe793267c959829fd
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmg4-6gfg-83qx

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