GHSA-vmg4-6gfg-83qx

ghsaUSosv

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

view advisory published 2026-09-02Licence: CC-BY-4.0

The vulnerability is a single-request persistent DoS by submitting e.g. "PATCH /api/v1/article/<id>" with a valid editor session and body of {"toString.call":"x"}, overwriting the global toString function with value x. Fabian

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-71553US	—	0.43% (37th)	—	2026-08-17
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 t…

references

External citations — patches, advisories, analysis.

https://github.com/apostrophecms/apostrophePACKAGE
https://github.com/apostrophecms/apostrophe/commit/5a3746aaed49761e171c2cbfe793267c959829fdWEB
https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmg4-6gfg-83qxWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-71553ADVISORY

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