CVE-2026-40516

OpenHarness SSRF via web_fetch and web_search

State: Published
Severity: 7.8 High
Published: Apr 17, 2026
Updated: Jul 14, 2026
Reserved: Apr 13, 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.

Scores

CVSS	Score	Vector	Source
4.0	7.8 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:L/SA:L	VulnCheck
3.1	8.3 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L	VulnCheck

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
OpenHarnessHKUDS	before bd4df81f634f8c7cddcc3fdf7f561a13dcbf03aeAffected

References

https://github.com/HKUDS/OpenHarness/pull/92issue-tracking
https://github.com/HKUDS/OpenHarness/commit/bd4df81f634f8c7cddcc3fdf7f561a13dcbf03aepatch
https://www.vulncheck.com/advisories/openharness-ssrf-via-web-fetch-and-web-searchthird-party-advisory

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