Cross-account tracker deletion via unconstrained lookup
Published Jan 20, 2026 · Updated Jan 20, 2026
Authorization bypass in Revive Adserver 6.0.4 and earlier allows remote authenticated users to delete trackers owned by other accounts. The tracker-delete.php script looked up each supplied trackerid without constraining the query by clientid, so the deletion loop accepted a cross-account tracker key. The account must have tracker-deletion permission, and successful exploitation removes another account's tracker and can disrupt tracking data.
Summary
What happened
Authorization bypass in Revive Adserver 6.0.4 and earlier allows remote authenticated users to delete trackers owned by other accounts. The tracker-delete.php script looked up each supplied trackerid without constraining the query by clientid, so the deletion loop accepted a cross-account tracker key. The account must have tracker-deletion permission, and successful exploitation removes another account's tracker and can disrupt tracking data.
The record
- CVE
- CVE-2026-21641
- Published
- Jan 20, 2026
- Updated
- Jan 20, 2026
- Vendor
- Revive Adserver Project
- Product
- Revive Adserver
- Classifications
- CWE-285, CWE-639, T1485
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 20, 2026CVE publishedPublication date reported by the CVE source.
- Jan 20, 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=6 <=6.0.4
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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