CVE-2026-55610 InvoiceShelf has cross-company user read/update IDOR that enables cross-tenant account takeover
Attackers can read and modify user accounts across different companies, leading to data disclosure and account takeover in multi-tenant installations.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55610?
CVE-2026-55610 is a high-severity missing authorization vulnerability in InvoiceShelf, published on 23 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
InvoiceShelf is an open-source web & mobile app that helps track expenses, payments and create professional invoices and estimates. Prior to version 2.4.1, in InvoiceShelf's multi-company installations, any user who is an Owner of one company can read and overwrite any user account in any other company on the same installation. `GET/PUT /api/v1/users/{user}` resolves the target `User` by global primary key, and `UserPolicy` checks only that the requester owns their own header-company — it never verifies that the target user belongs to that company. This allows cross-tenant disclosure of user data and full account takeover (email/password overwrite + company re-assignment). Version 2.4.1 fixes the issue.
Weakness: CWE-639
Which versions are affected by CVE-2026-55610?
How do I fix CVE-2026-55610?
No fix has been published for CVE-2026-55610 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-55610 being exploited?
There is no known exploitation of CVE-2026-55610 in the wild and no public exploit code.
Sources
Also known as GHSA-vgx6-6cqr-m8qr.