Open redirect via substring-based social URL validation
Published May 10, 2022 · Updated Apr 8, 2026
Open redirect in Ultimate Member 2.3.1 and earlier allows remote attackers to send profile visitors to attacker-controlled sites. The is_url validation in includes/core/class-validation.php accepts a social URL when the expected domain appears anywhere in the string, so userinfo syntax containing an at sign passes while resolving to a different host. An attacker must publish the crafted value in a profile social field, and exploitation requires a visitor to click the rendered social icon.
Summary
What happened
Open redirect in Ultimate Member 2.3.1 and earlier allows remote attackers to send profile visitors to attacker-controlled sites. The is_url validation in includes/core/class-validation.php accepts a social URL when the expected domain appears anywhere in the string, so userinfo syntax containing an at sign passes while resolving to a different host. An attacker must publish the crafted value in a profile social field, and exploitation requires a visitor to click the rendered social icon.
The record
- CVE
- CVE-2022-1209
- Published
- May 10, 2022
- Updated
- Apr 8, 2026
- Vendor
- Ultimate Member Group Ltd
- Product
- Ultimate Member
- Classifications
- CWE-601, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 10, 2022CVE publishedPublication date reported by the CVE source.
- Apr 8, 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=0 <=2.3.1
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
- Security issues in URL and social fields reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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