ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS
High-risk advisory
CVE-2026-71553
Summary
ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persistent DoS
Why it matters
GitHub has published a reviewed security advisory for apostrophe. Prioritize it with other application dependency updates, especially because EPSS places it in the 24% percentile.
Operator check
Check whether apostrophe is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 7.1. EPSS probability: 0.3%; percentile: 24%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.