Critical severity · published Jul 30, 2026
CVE-2026-28812
Apache JSPWiki: UserManager does not sanity-check user database at startup
9.8
CVSS
0.7%
EPSS
No
On KEV
Description
UserManager lack of checks allows impersonation in Apache JSPWiki up to 2.12.3 which may allow attackers to escalate privileges.
Users are recommended to upgrade to version 2.12.4 or newer which fixes this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AJ
Apache JSPWiki · Apache Software Foundation
before 2.12.4 · source: vendor
JS
Jspwiki · Apache
before 2.12.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28812
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28812
Mailing List
https://lists.apache.org/thread/n3m666d6t6871dldvz3ct49ooqkbgw2p
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/30/15
More from Apache JSPWiki
8.8
CVE-2026-28813
Apache JSPWiki: JSPWiki vulnerable to JSON hijacking
8.8
CVE-2022-34158
User Group Privilege Escalation
7.5
CVE-2026-28814
Apache JSPWiki: Pre-Authentication Arbitrary Wiki Markup Rendering
7.5
CVE-2026-28811
Apache JSPWiki: Error Handling - Reveals Error Details
6.5
CVE-2026-48910
Apache JSPWiki: Markdown parser allows XSS injection in Markdown error processing