What is CVE-2026-39857?

CVE-2026-39857 is a medium-severity vulnerability in Apostrophecms Apostrophe, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-15.

How severe is CVE-2026-39857?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Apostrophecms Apostrophe

CVE-2026-39857

ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain an authorization bypass vulnerability in the choices and counts query parameters of the REST API, where these query builders execute Mongo…

Vulnerability class: Information Disclosure

EPSS: 0.000 (9.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Apostrophecms Apostrophe — versions < 4.29.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-c276-fj82-f2pq (x_refsource_CONFIRM)
https://github.com/apostrophecms/apostrophe/commit/6c2b548dec2e3f7a82e8e16736603f4cd17525aa (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39857?: CVE-2026-39857 is a medium-severity vulnerability in Apostrophecms Apostrophe, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-04-15.
How severe is CVE-2026-39857?: Medium severity. CVSS v3 base score is 5.3 out of 10.