CVE-2026-41034 — MEDIUM (5.0)

Vulnerability Description

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.

CVSS Score

5.0

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Related Weaknesses (CWE)

CWE-125

References

https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md

FAQ

What is CVE-2026-41034?

CVE-2026-41034 is a vulnerability with a CVSS score of 5.0 (MEDIUM). 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.

How severe is CVE-2026-41034?

CVE-2026-41034 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-41034?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.