Account takeover via unsigned JSON token
Published Jan 20, 2026 · Updated Jan 20, 2026
Improper authentication in CRMEB 5.6.0 through 5.6.3 allows remote attackers to obtain user sessions via forged JSON tokens. remoteRegister decodes remote_token as URL-safe Base64 JSON without verifying a JWT signature, then trusts its uid to select or create an account. No prior authentication is required; an existing uid yields that user's session, while a new uid creates an account with attacker-supplied balance and profile data.
Summary
What happened
Improper authentication in CRMEB 5.6.0 through 5.6.3 allows remote attackers to obtain user sessions via forged JSON tokens. remoteRegister decodes remote_token as URL-safe Base64 JSON without verifying a JWT signature, then trusts its uid to select or create an account. No prior authentication is required; an existing uid yields that user's session, while a new uid creates an account with attacker-supplied balance and profile data.
The record
- CVE
- CVE-2026-1203
- Published
- Jan 20, 2026
- Updated
- Jan 20, 2026
- Vendor
- CRMEB
- Product
- CRMEB
- Classifications
- CWE-287, T1190
- Attack vector
- network
- Privileges
- unauthenticated
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=5.6.0
- Affected versionversion=5.6.1
- Affected versionversion=5.6.2
- Affected versionversion=5.6.3
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.
Public exploit references
- remote_register JWT authentication-bypass proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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