Moderator account takeover via unverified password change
Published Feb 16, 2026 · Updated Feb 16, 2026
Unverified password change in vichan 5.1.0 through 5.1.5 allows remote authenticated users to replace the active moderator password. The handler in inc/mod/pages.php writes a new password hash when the session user ID matches the target ID, without checking the current password or re-authenticating the session. A valid moderator session with password-change permission is required; exploitation makes a compromised session persistent by replacing that moderator's credential.
Summary
What happened
Unverified password change in vichan 5.1.0 through 5.1.5 allows remote authenticated users to replace the active moderator password. The handler in inc/mod/pages.php writes a new password hash when the session user ID matches the target ID, without checking the current password or re-authenticating the session. A valid moderator session with password-change permission is required; exploitation makes a compromised session persistent by replacing that moderator's credential.
The record
- CVE
- CVE-2026-2543
- Published
- Feb 16, 2026
- Updated
- Feb 16, 2026
- Vendor
- vichan-devel
- Product
- vichan
- Classifications
- CWE-620, CWE-640, T1098
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Feb 16, 2026CVE publishedPublication date reported by the CVE source.
- Feb 16, 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=5.1.0
- Affected versionversion=5.1.1
- Affected versionversion=5.1.2
- Affected versionversion=5.1.3
- Affected versionversion=5.1.4
- Affected versionversion=5.1.5
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
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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