Audit Log Forgery in Bitwarden Server by Bitwarden
CVE-2026-71959

6.9MEDIUM

Key Information:

Vendor

Bitwarden

Status
Server
Vendor
CVE Published:
10 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-71959?

Bitwarden Server prior to version 2026.7.2 contains a vulnerability that allows any authenticated user to send a POST request to the /collect endpoint without verifying their membership in the respective organization. This flaw enables users to forge audit log entries, potentially leading to significant data integrity issues as they can create arbitrary, backdated entries that can misrepresent user actions within the organization.

Affected Version(s)

server 0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-71959 - Proof of Concept

References

https://sanjokkarki.com.np/blog/bitwarden-audit-log-forgery
technical-descriptionexploit
https://github.com/bitwarden/server/releases/tag/v2026.7.2
release-notes
https://github.com/bitwarden/server/pull/7934
issue-tracking

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sanjok Karki
.