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CVE-2026-40516

Hkuds Openharness server-side request forgery (SSRF)

8.3 HIGHPublic exploitEPSS 0.29%
  1. Published17 Apr 2026

Description

OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and web_search tools that allows attackers to access private and localhost HTTP services by manipulating tool parameters without proper validation of target addresses. Attackers can influence an agent session to invoke these tools against loopback, RFC1918, link-local, or other non-public addresses to read response bodies from local development services, cloud metadata endpoints, admin panels, or other private HTTP services reachable from the victim host.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Affected products

Hkuds Openharness< 2026-04-11

Remediation

Fixed in
Hkuds Openharness≥ 2026-04-11

References

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Frequently asked

Is CVE-2026-40516 being actively exploited?

CVE-2026-40516 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.29%.

How severe is CVE-2026-40516?

CVE-2026-40516 has a CVSS 3.1 base score of 8.3, rated high. EPSS estimates a 0.29% probability of exploitation.

Which products are affected by CVE-2026-40516?

Affected products include Hkuds Openharness.

How do I fix CVE-2026-40516?

Upgrade affected software to a fixed version, for example Hkuds Openharness 2026-04-11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40516 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.