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PHP CVE-2026-21641

MEDIUM
Improper Authorization (CWE-285)
2026-01-20 support@hackerone.com
PHP Revive Adserver
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 20, 2026 - 21:16 nvd
MEDIUM 6.5

DescriptionCVE.org

HackerOne community member Jad Ghamloush (0xjad) has reported an authorization bypass vulnerability in the tracker-delete.php script of Revive Adserver. Users with permissions to delete trackers are mistakenly allowed to delete trackers owned by other accounts.

AnalysisAI

Revive Adserver contains an authorization flaw in the tracker deletion function that permits authenticated users to delete trackers belonging to other accounts. An attacker with valid credentials can exploit this access control bypass to remove tracking objects outside their administrative scope, potentially disrupting competitor or other user operations. …

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Vulnerability AssessmentAI

Risk Assessment CVSS 6.5 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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CVE-2026-21641 vulnerability details – vuln.today
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