User impersonation via untrimmed username whitespace
Published Nov 20, 2025 · Updated Nov 20, 2025
Improper whitespace neutralization in Revive Adserver 6.0.2 and earlier allows remote authenticated users to create deceptive usernames. The new-user validation accepts and stores usernames with leading or trailing whitespace instead of trimming or rejecting the edge characters. User-creation privileges are required, and the interface can render the crafted account like its legitimate counterpart, enabling account confusion or impersonation.
Summary
What happened
Improper whitespace neutralization in Revive Adserver 6.0.2 and earlier allows remote authenticated users to create deceptive usernames. The new-user validation accepts and stores usernames with leading or trailing whitespace instead of trimming or rejecting the edge characters. User-creation privileges are required, and the interface can render the crafted account like its legitimate counterpart, enabling account confusion or impersonation.
The record
- CVE
- CVE-2025-55127
- Published
- Nov 20, 2025
- Updated
- Nov 20, 2025
- Vendor
- Revive Adserver Project
- Product
- Revive Adserver
- Classifications
- CWE-156, T1136
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 20, 2025CVE publishedPublication date reported by the CVE source.
- Nov 20, 2025Record 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 <=6.0.2
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
- HackerOne report 3413764 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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