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CVE-2026-81093: Server-Side Request Forgery (SSRF) in apify actors-mcp-server

0
High
VulnerabilityCVE-2026-81093cvecve-2026-81093
Published: 08/27/2026 (08/27/2026, 14:50:34 UTC)
Source: CVE Database V5
Vendor/Project: apify
Product: actors-mcp-server

Description

The get-html-skeleton tool fetched a URL the caller supplied after checking only its syntax. The handler in src/tools/common/get_html_skeleton.ts validated the url argument with isValidHttpUrl from src/utils/generic.ts, which confirmed the string began with an http or https scheme and parsed as a URL and inspected neither the host name nor the address it resolves to. Loopback, link-local and private ranges therefore passed, including the address cloud providers use to serve instance metadata. The unchecked URL was handed to the web-browser actor and the fetched document was returned in the tool response, so any caller of the MCP server could make it request an endpoint reachable only from the host and read the result, including instance credentials. Version 0.9.12 removes the tool.

CVSS v4.0

Score 8.7high

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
High
Vuln. Integrity
None
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Affected software

GitHub Actionsmore threats →cve
actors-mcp-server
pkg:github/actors-mcp-server
Affected versions
<0.9.12

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Data Version
5.2
Assigner Short Name
VulnCheck
Date Reserved
2026-08-26T16:00:31.295Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a906bafacd9273b4983a0eb

Added to database: 08/27/2026, 16:54:07 UTC

Last updated: 08/28/2026, 00:59:08 UTC

Views: 13

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