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Public proof of conceptFix available

CVE-2023-34939

A public proof of concept exists; no exploitation attested.

  • Published2023-06-22
  • Fixed in12.5.2
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Onlyoffice Community Server before v12.5.2 was discovered to contain a remote code execution (RCE) vulnerability via the component UploadProgress.ashx.

Timeline

dates in UTC
  1. 2023-06-2212:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-34939?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-34939?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Onlyoffice
BranchAffectedFixed in
12.5< 12.5.212.5.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Onlyoffice to 12.5.2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-06-22
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8rx2-c38v-6hm8

Frequently asked questions

What is CVE-2023-34939?

Onlyoffice Community Server before v12.5.2 was discovered to contain a remote code execution (RCE) vulnerability via the component UploadProgress.ashx.

Is CVE-2023-34939 actively exploited?

A proof-of-concept exploit exists for CVE-2023-34939, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-34939?

CVE-2023-34939 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record