PatchTheCEVCVE-2026-28812: UserManager lack of checks allows impersonation in Apache JSPWiki up to 2.12.3 which may allow attackers to es
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CRITICAL 9.8REMOTEWATCHLISTUPGRADE
CVE-2026-28812 is a critical-severity flaw (CVSS 9.8) affecting jspwiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 48%) |
| CISA exploited list | No |
| Weakness | CWE-290 |
| Published | 2026-07-30 |
| Last modified | 2026-10-23 |
Publisher (CNA): Apache Software Foundation · Vendor: apache
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
apache jspwiki UPGRADE
Affected: < 2.12.4
Fixed in: 2.12.4
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy jspwiki || rpm -q jspwiki || jspwiki --version
2. UPGRADE to 2.12.4 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade jspwiki
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade jspwiki
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Exact fixes by distribution
Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-28811 HIGH 7.5 UPGRADE Debug Messages Revealing Unnecessary Information in Apache JSPWiki up to 2.12.3. Users are recommended to upgr
- CVE-2026-28814 HIGH 7.5 UPGRADE Arbitrary Wiki Markup rendering due to lack of authentication in Apache JSPWiki up to 2.12.3 allows attacker t
- CVE-2026-28813 HIGH 8.8 UPGRADE Apache JSPWiki, up to 2.12.3, is vulnerable to JSON Hijacking, which leads to csrf vulnerabilities. Users are
- CVE-2026-48910 MEDIUM 6.5 UPGRADE A carefully crafted editing request could trigger an XSS vulnerability on Apache JSPWiki when parsing errors