CVE-2026-21789 HCL Connections is vulnerable to broken access control
An unauthorized user can update data in HCL Connections due to broken access control, requiring administrators to apply vendor patches.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-21789?
CVE-2026-21789 is a medium-severity missing authorization vulnerability in HCLSoftware Connections, published on 18 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
HCL Connections contains a broken access control vulnerability that may allow unauthorized user to update data in certain scenarios.
Weakness: CWE-863
Which versions are affected by CVE-2026-21789?
How do I fix CVE-2026-21789?
No fix has been published for CVE-2026-21789 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-2026-21789 being exploited?
There is no known exploitation of CVE-2026-21789 in the wild and no public exploit code.
Sources
Also known as GHSA-hx5c-g9jj-chxv.