Quick answers
- Is CVE-2026-28812 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-28812 being exploited in the wild.
- How severe is CVE-2026-28812?
- Informational severity, with a CVSS score of 0, published 30 July 2026.
- Which products and versions are affected?
- Apache Software Foundation JSPWiki up to 2.12.3.
- Is there a fix for CVE-2026-28812?
- A patch was published on 2026-07-30: Fixed in version 2.12.4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-28812 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-28812?
- Check whether you run Apache Software Foundation JSPWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A vulnerability exists in Apache JSPWiki's UserManager component due to insufficient sanity checks of the user database at startup. This flaw allows an attacker to perform user impersonation, which can lead to unauthorized privilege escalation within the application. The vulnerability affects all versions of Apache JSPWiki up to and including 2.12.3. The issue is resolved in version 2.12.4, which introduces the necessary validation checks. While the specific exploitation mechanism (e.g., database manipulation or session hijacking) is not detailed in the advisory, the root cause is identified as a failure to validate the integrity of the user store.
Affected products
- Apache Software Foundation JSPWiki up to 2.12.3
Timeline
- 2026-07-30: disclosed
- 2026-07-30: advisory
- 2026-07-30: patched: Fixed in version 2.12.4