CVE-2026-28812Network attack vectorHinoki check available

Privilege escalation via unchecked user database initialization

Published Jul 30, 2026 · Updated Jul 30, 2026

Authentication bypass in Apache JSPWiki 2.12.3 and earlier allows remote attackers to impersonate users and escalate privileges. UserManager starts without sanity-checking the user database; Apache has not disclosed the omitted validation or how a request selects an identity. Network access, no prior privileges, and no user interaction are required; impersonation confers the impersonated user's privileges.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in Apache JSPWiki 2.12.3 and earlier allows remote attackers to impersonate users and escalate privileges. UserManager starts without sanity-checking the user database; Apache has not disclosed the omitted validation or how a request selects an identity. Network access, no prior privileges, and no user interaction are required; impersonation confers the impersonated user's privileges.

The record

CVE
CVE-2026-28812
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
The Apache Software Foundation
Product
Apache JSPWiki
Classifications
CWE-290, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.12.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache JSPWikiversion=0 <2.12.4

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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