Server-side request forgery in Matomo exposes sensitive information
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.
Summary
Matomo 5.11.2 is affected. A server-side request forgery flaw (CWE-918) in the SiteContentDetector and SitesManager components lets a remote attacker with low privileges obtain sensitive information. The supplier disputes this report, noting that site administrators are trusted and would not plausibly set main_url to a URL that offers an adversary additional information.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Matomo.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-16 Threatist record created from CVE-2026-78850
- 2026-10-26 Title updated · CNA
- 2026-10-26 1 new reference · CNA
- 2026-10-27 Alias added: GHSA-rw9v-xch6-cr33
References
Sources
- CVE-2026-78850 · CVE Program
- CVE-2026-78850 · NVD
- FIRST EPSS
- GHSA-rw9v-xch6-cr33 · GitHub Advisory Database · CC BY 4.0
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