TI-2026-60283 Aliases CVE-2026-88899

knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header

MEDIUM 50CWE-73Published 2026-09-10 · Updated 2026-09-11

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00809 57th percentileScored 2026-11-07

Fix Fixed knowns (knowns-dev): 0.31.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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
knowns-dev	knowns	before 0.31.0	0.31.0	Patch available	CNA

knowns Vendorknowns-dev Affected before 0.31.0 Fixed in 0.31.0 Patch available CNA

Remediation

Fix · CNA knowns (knowns-dev) Fixed in 0.31.0

Timeline

2026-10-02 Threatist record created from CVE-2026-88899

References

Patch 1

https://github.com/knowns-dev/knowns/commit/37db0561b37b48b8bd035a417d7f1da6258ae657

Advisory 1

GitHub Security Advisory (GHSA-9h2q-r9fh-f98w)

Other 2

TI-2026-60300 knowns through 0.33.0 Authorization Bypass via project.set Bootstrap Exemption CVSS 4.0HIGH 8.7
TI-2026-60298 knowns through 0.33.0 Path Traversal via Template Engine CVSS 4.0HIGH 8.6
TI-2026-59217 knowns before 0.30.0 Arbitrary Code Execution via LSP Binary CVSS 4.0HIGH 8.5
TI-2026-60301 knowns through 0.33.0 Arbitrary Directory Enumeration via workspace browse endpoint CVSS 4.0MEDIUM 6.9
TI-2026-60299 knowns through 0.33.0 Path Traversal via code.find MCP tool CVSS 4.0HIGH 7.1
TI-2026-59220 knowns before 0.30.0 Unauthenticated Management API Exposure CVSS 4.0CRITICAL 9.3

See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences