CVE-2026-78850 Server-side request forgery in n/a
A remote attacker can exploit an SSRF vulnerability in Matomo to obtain sensitive information via the SiteContentDetector component.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78850?
CVE-2026-78850 is a medium-severity server-side request forgery vulnerability in n/a, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue in Matomo v.5.11.2 allows a remote attacker to obtain sensitive information via the SiteContentDetector / SitesManager component. NOTE: the Supplier disputes the relevance of this report because the site administrator is a trusted party, and would not plausibly set main_url to a URL that offers additional information to an adversary.
Weakness: CWE-918
Which versions are affected by CVE-2026-78850?
How do I fix CVE-2026-78850?
No fix has been published for CVE-2026-78850 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-78850 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78850 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as DEBIAN-CVE-2026-78850, GHSA-rw9v-xch6-cr33, UBUNTU-CVE-2026-78850.