TI-2026-74433 Aliases CVE-2026-110774

Broken access control in Blinko lets users read private attachments

MEDIUM 60CWE-639Published 2026-10-14 · Updated 2026-10-15

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

Blinko through 1.8.8 from blinkospace has a broken access control flaw in the /api/file route caused by a flawed owner check (CWE-639). An authenticated user with low privileges can download other users' private, non-shared attachments by supplying a stored filename that follows a basename plus millisecond-timestamp pattern. A public proof-of-concept exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Blinko through 1.8.8 contains a broken access control vulnerability in the /api/file route that allows authenticated users to read other users' private attachments due to a flawed owner check. Attackers can supply another user's stored filename, following a basename plus millisecond-timestamp pattern, to download private, non-shared attachments.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00237 14th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

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
blinkospace	blinko	up to 1.8.8	—	No fix listed	CNA

blinko Vendorblinkospace Affected up to 1.8.8 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:blinko:blinko::::::::	—	—	blinkospace

cpe:2.3:a:blinko:blinko:*:*:*:*:*:*:*:* Versions — — ·blinkospace

Remediation

The sources list no fixed version for Blinko.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-15 Threatist record created from CVE-2026-110774
2026-10-15 CISA SSVC decision points changed

References

Exploit 1

https://hackmd.io/@hieuPenguinnn/blinko-attachment-accountid-idor

Other 2

TI-2026-70828 Path traversal in Blinko plugin install overwrites startup files CVSS 3.1HIGH 8.8
TI-2026-58732 Blinko 1.8.7 Cross-User AI Conversation Read and Write via message tRPC Router CVSS 4.0HIGH 8.7
TI-2026-58749 Blinko 1.8.7 Cross-User Private Note Disclosure via noteReferenceList CVSS 4.0HIGH 7.1
TI-2026-19240 Blinko: Admin RCE - MCP Server Command Injection CVSS 4.0HIGH 8.6
TI-2026-18915 Blinko: Unauthorized Arbitrary File Read - /api/file/temp CVSS 4.0HIGH 8.2
TI-2026-18919 Blinko: Unauthorized User Information Leak CVSS 4.0MEDIUM 6.9

See all 14 →

Sources

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