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TI-2026-29673 Aliases CVE-2026-41034GHSA-28j6-w975-f9x7

Out-of-bounds read in Ascensio ONLYOFFICE DocumentServer

Priority LOW 23CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

ONLYOFFICE DocumentServer before 9.3.0 has an untrusted pointer dereference in XLS processing/conversion (via pictFmla.cbBufInCtlStm and other vectors), leading to an information leak and ASLR bypass.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00295 22nd percentileScored 2026-11-07
Fix Fixed ONLYOFFICE DocumentServer (Ascensio): 9.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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

VendorProductAffected versionsFixed inStatusSource
AscensioONLYOFFICE DocumentServerbefore 9.3.09.3.0Patch availableCNA
  • ONLYOFFICE DocumentServer VendorAscensio Affected before 9.3.0 Fixed in 9.3.0 Patch available CNA

Remediation

  • Fix · CNA ONLYOFFICE DocumentServer (Ascensio) Fixed in 9.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41034
  2. 2026-10-03 Alias added: GHSA-28j6-w975-f9x7

References

Other 1

  • TI-2026-29670 In ONLYOFFICE DesktopEditors before 9.3.0, the update service allows attackers to perform… CVSS 3.1MEDIUM 6.2

Sources

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