CVE-2026-28812: Apache JSPWiki: UserManager does not sanity-check user database at startup

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-30 · updated 2026-10-23
Weakness: CWE-290

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.

Affected products

Apache Software Foundation Apache JSPWiki: before 2.12.4 — fixed in 2.12.4

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache JSPWiki 2.12.4. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/n3m666d6t6871dldvz3ct49ooqkbgw2p
http://www.openwall.com/lists/oss-security/2026/07/30/15

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