Cross-user request forcing via CSS escape bypass
Published Aug 19, 2026 · Updated Aug 19, 2026
CSS sanitizer bypass in Maalfer Pentestify 1.2.0 through 2.3.2 allows remote authenticated users to force victim browsers to fetch attacker URLs. The sanitize_css_source() routine in backend/schemas.py applies a literal blocklist for url() before decoding CSS escapes, so sequences such as \75 rl( are reconstructed by the browser tokenizer after validation and survive into injected custom_css. Any authenticated account can store the theme through POST /api/themes or the global report_theme setting, causing every user who loads the application to disclose IP address and User-Agent to an attacker-controlled host without script execution.
Summary
What happened
CSS sanitizer bypass in Maalfer Pentestify 1.2.0 through 2.3.2 allows remote authenticated users to force victim browsers to fetch attacker URLs. The sanitize_css_source() routine in backend/schemas.py applies a literal blocklist for url() before decoding CSS escapes, so sequences such as \75 rl( are reconstructed by the browser tokenizer after validation and survive into injected custom_css. Any authenticated account can store the theme through POST /api/themes or the global report_theme setting, causing every user who loads the application to disclose IP address and User-Agent to an attacker-controlled host without script execution.
The record
- CVE
- CVE-2026-76203
- Published
- Aug 19, 2026
- Updated
- Aug 19, 2026
- Vendor
- Maalfer
- Product
- Pentestify
- Classifications
- CWE-180
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 19, 2026CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=1.2.0 <1ed1aad
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What is affected?
Published CVSS scores
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Attacks
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