Basic Authentication Flaw in Apache Solr Affects User Security
CVE-2026-44825

8.1HIGH

Key Information:

Vendor

Apache
Status
Apache Solr
Vendor
CVE Published:
1 June 2026

What is CVE-2026-44825?

A vulnerability in Apache Solr allows for remote unauthorized access due to hardcoded default credentials in the Basic Authentication setup tool. Versions 9.4.0 through 9.10.1 and 10.0.0 are particularly exposed, as attackers can leverage these known credentials to gain full control over the Solr cluster. To mitigate risk, it's critical to either remove the vulnerable template users from the security.json file or change their passwords. Future versions, 9.11.0 and 10.1.0, are expected to address this flaw. Clusters not using the BasicAuth bootstrap method or those with strong passwords set for template users are not affected.

Affected Version(s)

Apache Solr 9.4.0 <= 9.10.1

Apache Solr 10.0.0

References

https://lists.apache.org/thread/5xg6xr99glocp3zsg9ht2zlbw...
vendor-advisory

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Naveen Sunkavally, Horizon3.ai
.