CVE-2026-44825: Apache Solr versions 9.4.0 to 10.0.0: Default Credentials Allow Unauthorized Access

Summary

Apache Solr versions 9.4.0 to 10.0.0 contain hardcoded default credentials that can be used by an attacker to gain full administrative access to the cluster. To protect your cluster, delete or change the passwords of the default users (superadmin, admin, search, index) in the security.json file. Upgrading to a future version (9.11.0 or 10.1.0) will also resolve the issue.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions
apache	solr	>= 9.4.0, <= 9.10.1 10.0.0 `cpe:2.3:a:apache:solr::::::::`

Original title

Hardcoded credentials in the Basic Authentication setup tool (bin/solr auth enable) in Apache Solr versions 9.4.0 through 9.10.1 and 10.0.0 allows a remote attacker to gain full administrative acce...

Original description

Hardcoded credentials in the Basic Authentication setup tool (bin/solr auth enable) in Apache Solr versions 9.4.0 through 9.10.1 and 10.0.0 allows a remote attacker to gain full administrative access to the cluster via publicly known default credentials installed silently alongside the user-specified account.

As an immediate workaround without upgrading, delete the template users (superadmin, admin, search, index) from security.json or change their passwords.
The future, not yet released, versions 9.11.0 and 10.1.0 will not be vulnerable, and it will be enough to upgrade to solve the issue.

Not affected:
* Clusters where bin/solr auth enable was not used to bootstrap BasicAuth
* Clusters where template users have been assigned strong passwords after bootstrap

nvd CVSS3.1 8.1

Vulnerability type

CWE-798 Use of Hard-coded Credentials

CWE-1188

https://lists.apache.org/thread/5xg6xr99glocp3zsg9ht2zlbwlrst7ch
http://www.openwall.com/lists/oss-security/2026/05/29/6 Mailing List Third Party Advisory