What is CVE-2021-40864?

CVE-2021-40864 is a critical-severity vulnerability in Onlyoffice Google Translate. CVSS score: 9.8/10. Published 2021-09-10.

How severe is CVE-2021-40864?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Onlyoffice Google Translate

CVE-2021-40864

The Translate plugin 6.1.x through 6.3.x before 6.3.0.72 for ONLYOFFICE Document Server lacks escape calls for the msg.data and text fields.

Published 2021-09-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Onlyoffice Google Translate

References

github.com/ONLYOFFICE/plugin-translator/commit/2206c0179cb97e3b8b290a0ab5719b1f… (Patch, Third Party Advisory)
github.com/ONLYOFFICE/plugin-translator/compare/v6.3.0.71...v6.3.0.72 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40864?: CVE-2021-40864 is a critical-severity vulnerability in Onlyoffice Google Translate. CVSS score: 9.8/10. Published 2021-09-10.
How severe is CVE-2021-40864?: Critical severity. CVSS v3 base score is 9.8 out of 10.