TI-2021-19373 Aliases CVE-2021-43446 GHSA-5w4f-g47c-43mg

ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Cross Site Scripting (XSS).

MEDIUM 60CWE-79Published 2023-01-23 · Updated 2025-04-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Cross Site Scripting (XSS). The "macros" feature of the document editor allows malicious cross site scripting payloads to be used.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0084 58th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

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
—	—	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:server::::::::	up to 7.0.0.49	Vulnerable	ONLYOFFICE

cpe:2.3:a:onlyoffice:server:*:*:*:*:*:*:*:* Versions up to 7.0.0.49 Vulnerable ·ONLYOFFICE

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-43446
2026-10-03 Alias added: GHSA-5w4f-g47c-43mg

References

Exploit 1

https://labs.nettitude.com/blog/exploiting-onlyoffice-web-sockets-for-unauthenticated-remote-code-execution/

Advisory 2

TI-2021-19374 ONLYOFFICE all versions as of 2021-11-08 is affected by Incorrect Access Control. CVSS 3.1HIGH 7.5
TI-2021-19376 ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Server-Side Request Forgery… CVSS 3.1HIGH 8.1
TI-2021-19375 ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation. CVSS 3.1MEDIUM 5.3
TI-2021-19372 ONLYOFFICE all versions as of 2021-11-08 is affected by Incorrect Access Control. CVSS 3.1CRITICAL 9.8
TI-2021-19371 ONLYOFFICE all versions as of 2021-11-08 is affected by Incorrect Access Control. CVSS 3.1HIGH 7.5

Sources

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