Admin API key theft via reflective CORS
Published May 12, 2026 · Updated May 12, 2026
Permissive CORS in Cleanuparr before 2.9.10 allows remote attackers to steal an administrator API key through a malicious webpage. The global policy reflects every Origin while allowing credentials, and TrustedNetworkAuthenticationHandler grants administrator identity solely from a trusted source IP. Exploitation requires trusted-network authentication to be enabled and a user on a trusted IP to visit attacker-controlled content; the exposed permanent key permits later administrative API access.
Summary
What happened
Permissive CORS in Cleanuparr before 2.9.10 allows remote attackers to steal an administrator API key through a malicious webpage. The global policy reflects every Origin while allowing credentials, and TrustedNetworkAuthenticationHandler grants administrator identity solely from a trusted source IP. Exploitation requires trusted-network authentication to be enabled and a user on a trusted IP to visit attacker-controlled content; the exposed permanent key permits later administrative API access.
The record
- CVE
- CVE-2026-44184
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Vendor
- Cleanuparr
- Product
- Cleanuparr
- Classifications
- CWE-942, CWE-346, T1528
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 12, 2026CVE publishedPublication date reported by the CVE source.
- May 12, 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=< 2.9.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- GHSA-rwpc-36mg-fpvf browser proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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