PatchTheCVECVE-2026-39857: ApostropheCMS is an open-source Node.js content management system
CVE-2026-39857 is a medium-severity flaw (CVSS 5.3) affecting apostrophecms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 MongoDB distinct() operations that bypass the publicApiProjection restrictions intended to limit which fields are exposed publicly. The choices and counts parameters are processed via applyBuildersSafely before the p
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 62%) |
| CISA exploited list | No |
| Weakness | CWE-200 |
| Published | 2026-04-15 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-39857?
apostrophecms: upgrade to 4.29.0. Exact commands for each OS are on this page.
Is CVE-2026-39857 being exploited?
CVE-2026-39857 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-39857 affect?
CVE-2026-39857 affects apostrophecms. Severity is medium (CVSS 5.3). 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 MongoD
How urgent is CVE-2026-39857?
Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action
Software pages
Node.js vulnerabilities · MongoDB vulnerabilities
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