Open redirect via unvalidated css parameter
Published May 14, 2024 · Updated Apr 8, 2026
Open redirect in WP Compress – Instant Performance & Speed Optimization 6.20.01 and earlier allows remote attackers to redirect users via the css parameter. In fixCss.php, a failed CSS-extension check places the untrusted css value directly into an HTTP Location header without restricting its destination. Exploitation requires a victim to follow an attacker-crafted request, after which the trusted site redirects the victim to an attacker-chosen site.
Summary
What happened
Open redirect in WP Compress – Instant Performance & Speed Optimization 6.20.01 and earlier allows remote attackers to redirect users via the css parameter. In fixCss.php, a failed CSS-extension check places the untrusted css value directly into an HTTP Location header without restricting its destination. Exploitation requires a victim to follow an attacker-crafted request, after which the trusted site redirects the victim to an attacker-chosen site.
The record
- CVE
- CVE-2023-6812
- Published
- May 14, 2024
- Updated
- Apr 8, 2026
- Vendor
- WP Compress
- Product
- WP Compress – Instant Performance & Speed Optimization
- Classifications
- CWE-601, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 14, 2024CVE 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 <=6.20.01
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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