CVE-2017-16935

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-11-24 · updated 2026-06-17
Weakness: CWE-20

Description

Ametys before 4.0.3 requires authentication only for URIs containing a /cms/ substring, which allows remote attackers to bypass intended access restrictions via a direct request to /plugins/core-ui/servercomm/messages.xml, as demonstrated by changing the admin password by obtaining account details via a users/search.json request, and then modifying the account via an editUser request.

Affected products

Ametys CMS: before 4.0.3 — fixed in 4.0.3

How to fix

Upgrade to a fixed version: Ametys CMS 4.0.3. Check the vendor advisory for mitigations.

References

https://blogs.securiteam.com/index.php/archives/3517
https://issues.ametys.org/browse/RUNTIME-2582
https://blogs.securiteam.com/index.php/archives/3517
https://issues.ametys.org/browse/RUNTIME-2582

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