TI-2021-19375 Aliases CVE-2021-43448 GHSA-hq34-fgpx-qmf6

ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation.

MEDIUM 57CWE-20Published 2023-01-23 · Updated 2025-04-02

Key facts

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

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

Summary

ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Improper Input Validation. A lack of input validation can allow an attacker to spoof the names of users who interact with a document, if the document id is known.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01031 63rd 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-2021-43448
2026-10-03 Alias added: GHSA-hq34-fgpx-qmf6

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-2021-19373 ONLYOFFICE all versions as of 2021-11-08 is vulnerable to Cross Site Scripting (XSS). CVSS 3.1MEDIUM 6.1
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