Stored XSS via unescaped uploaded filenames
Published May 5, 2025 · Updated May 6, 2025
Stored XSS in the Forms module of Mezzanine CMS 6.0.0 allows remote attackers to execute JavaScript when an administrator views a submitted file. forms.py passes an attacker-controlled upload filename into mark_safe during form-entry link rendering, suppressing Django's HTML escaping. Exploitation requires a File Upload field and an administrator to open View Entries, after which the script runs in that administrator's browser.
Summary
What happened
Stored XSS in the Forms module of Mezzanine CMS 6.0.0 allows remote attackers to execute JavaScript when an administrator views a submitted file. forms.py passes an attacker-controlled upload filename into mark_safe during form-entry link rendering, suppressing Django's HTML escaping. Exploitation requires a File Upload field and an administrator to open View Entries, after which the script runs in that administrator's browser.
The record
- CVE
- CVE-2025-29573
- Published
- May 5, 2025
- Updated
- May 6, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 5, 2025CVE publishedPublication date reported by the CVE source.
- May 6, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Weakness, pattern, technique
Public exploit references
- Malicious filename stored-XSS proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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