TI-2021-02273 Aliases CVE-2021-3199 GHSA-vm8r-r39c-96c6

Path traversal in ONLYOFFICE Document Server enables code execution

CRITICAL 100Exploited in the wildCWE-22Published 2021-01-22 · Updated 2026-10-09

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

ONLYOFFICE Document Server before 5.6.3 is affected when JWT is used. A path limitation flaw (CWE-22) lets a /.. sequence in an image upload parameter of the /upload endpoint reach directories outside the intended location, and an unauthenticated remote attacker can exploit it for remote code execution. CISA lists it in the Known Exploited Vulnerabilities catalog, added 2026-10-08.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.. sequence in an image upload parameter.

Why it matters now

Exploitation Active In CISA KEV since 2026-10-08CISA due date 2026-10-11

EPSS 0.30244 98th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Active
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
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:onlyoffice:document_server::::::::	before 5.6.3	Vulnerable	ONLYOFFICE

cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:* Versions before 5.6.3 Vulnerable ·ONLYOFFICE

Remediation

The sources list no fixed version for ONLYOFFICE Document Server. CISA requires U.S. federal agencies to fix it by 2026-10-11.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Timeline

2026-10-02 Threatist record created from CVE-2021-3199
2026-10-03 Alias added: GHSA-vm8r-r39c-96c6
2026-10-08 Added to CISA KEV
2026-10-08 CVSS score added · CISA ADP
2026-10-08 Weakness changed · CISA ADP
2026-10-08 CISA SSVC decision points changed
2026-10-08 Priority changed: MEDIUM → CRITICAL
2026-10-09 EPSS moved to the 95th–99th percentile
2026-10-09 CISA SSVC decision points changed

References

Exploit 2

Advisory 1

https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563

TI-2023-14162 An out of bounds memory access vulnerability in ONLYOFFICE DocumentServer 4.0.3 through… CVSS 3.1CRITICAL 9.8
TI-2023-14161 A use after free issue discovered in ONLYOFFICE DocumentServer 4.0.3 through 7.3.2 allows… CVSS 3.1CRITICAL 9.8
TI-2023-14163 Memory Exhaustion vulnerability in ONLYOFFICE Document Server 4.0.3 through 7.3.2 allows… CVSS 3.1HIGH 7.5
TI-2021-07886 A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer… CVSS 3.1CRITICAL 9.8
TI-2023-25368 Path Traversal vulnerability in ONLYOFFICE Document Server before v8.0.1 allows a remote… CVSS 3.1MEDIUM 6.7
TI-2023-27787 ONLYOFFICE Docs before 8.0.1 allows XSS because a macro is an immediately-invoked… CVSS 3.1MEDIUM 6.1

See all 20 →

Sources

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