Onlyoffice vulnerabilities1 known to be exploited.
Onlyoffice has 28 published vulnerabilities across 6 products in our catalogue. 1 of them is on the list of flaws known to be exploited, so criminals are using them now. The most affected product is Document Server, with 19. If you run Onlyoffice software, patch the exploited flaws first.
The most recent Onlyoffice flaw added to the known-exploited list is CVE-2021-3199, on 8 October 2026. We keep watching the known-exploited list.
Which Onlyoffice products have the most vulnerabilities?
Document Server leads with 19 published vulnerabilities. Open a product to see its versions and which of its flaws criminals are already using.
Which Onlyoffice vulnerabilities are being exploited?
1 flaw is on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 9.8ONLYOFFICE Docs Server Path Traversal Vulnerability
ONLYOFFICE Docs contains a path traversal vulnerability that can occur when JWT is used, via a /..
Which Onlyoffice flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- 44%CVE-2021-25833Critical
A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer v4.2.0.71-v5.6.0.21.
- 19%
Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /..
- 13%CVE-2021-25832Critical
A heap buffer overflow vulnerability inside of BMP image processing was found at [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v6.0.0.
- 12%CVE-2021-25830Critical
A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.2.0.236-v5.6.4.13.
- 12%CVE-2021-25831Critical
A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3.
- 7.4%CVE-2021-25829High
An improper binary stream data handling issue was found in the [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3.
- 6.9%CVE-2022-29776Critical
Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a stack overflow via the component DesktopEditor/common/File.cpp.
- 6.9%CVE-2022-29777Critical
Onlyoffice Document Server v6.0.0 and below and Core 6.1.0.26 and below were discovered to contain a heap overflow via the component DesktopEditor/fontengine/fontconverter/FontFileBase.h.
- 5.0%CVE-2023-34939Critical
Onlyoffice Community Server before v12.5.2 was discovered to contain a remote code execution (RCE) vulnerability via the component UploadProgress.ashx.
- 2.6%CVE-2020-11536Critical
An issue was discovered in ONLYOFFICE Document Server 5.5.0.
All Onlyoffice products we track.
5 products, most vulnerabilities first. Find the ones you run, then open a product to see its versions and exploited flaws.
- Document Serverdocument_server19 vulnerabilities93 versions
- Serverserver6 vulnerabilities1 version
- Corecore2 vulnerabilities1 version
- Google Translategoogle_translate1 vulnerability1,182 versions
- Onlyofficeonlyoffice1 vulnerability23 versions
This directory lists the 5 Onlyoffice products with at least one tracked version, of 6 in our catalogue.
Running Onlyoffice? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
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1 flaw being exploited affects software Acme tracks
ONLYOFFICE Docs contains a path traversal vulnerability that can occur when JWT is used, via a /.. sequence in an image upload parameter and could allow for remote code execution.
- Matched to
- Document Server on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
Our catalogue lists 28 published vulnerabilities across 6 products and 1,300 versions from Onlyoffice. The most recent Onlyoffice flaw added to the known-exploited list is CVE-2021-3199, on 8 October 2026.
1 Onlyoffice vulnerability is on the list of flaws known to be exploited. The most recently added is CVE-2021-3199. The full list is on this page.
Document Server, with 19 published vulnerabilities. Its own page lists the ones known to be exploited.
Create a Precursor Intelligence account and track the Onlyoffice products you run. We match them against every published flaw, give each one a risk score from 0 to 100 and tell you as soon as we spot one that affects you, by email, in the app or by webhook.