Unauthenticated data disclosure via missing view checks
Published Feb 21, 2026 · Updated Feb 21, 2026
Improper access control in Foswiki 2.1.10 and earlier allows remote attackers to disclose protected wiki data via crafted endpoint URLs. The oops and preview endpoints accept arbitrary template parameters without view checks, Changes omits a topic view check, and Viewfile tests attachment existence before authorization. No authentication is required; the endpoints reveal private page data or confirm protected attachment names, without reported write or service-interruption impact.
Summary
What happened
Improper access control in Foswiki 2.1.10 and earlier allows remote attackers to disclose protected wiki data via crafted endpoint URLs. The oops and preview endpoints accept arbitrary template parameters without view checks, Changes omits a topic view check, and Viewfile tests attachment existence before authorization. No authentication is required; the endpoints reveal private page data or confirm protected attachment names, without reported write or service-interruption impact.
The record
- CVE
- CVE-2026-2861
- Published
- Feb 21, 2026
- Updated
- Feb 21, 2026
- Vendor
- Foswiki
- Product
- Foswiki
- Classifications
- CWE-200, CWE-284, T1190, T1213
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 21, 2026CVE publishedPublication date reported by the CVE source.
- Feb 21, 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.
- Affected versionversion=2.1.0
- Affected versionversion=2.1.1
- Affected versionversion=2.1.10
- Affected versionversion=2.1.2
- Affected versionversion=2.1.3
- Affected versionversion=2.1.4
- Affected versionversion=2.1.5
- Affected versionversion=2.1.6
- Affected versionversion=2.1.7
- Affected versionversion=2.1.8
- Affected versionversion=2.1.9
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- Crafted Foswiki endpoint URL proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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