Stored XSS via unescaped breadcrumb filenames
Published Jul 15, 2022 · Updated Jul 9, 2026
Stored XSS in Gollum 5.0 through 5.1.1 allows remote attackers to execute JavaScript in another user's browser via a page filename. The Overview and Pages breadcrumb views interpolate filename-derived path elements into HTML without escaping, so an event-handler payload becomes executable markup. Exploitation requires a user to view a page listing or breadcrumb containing the attacker-created filename, enabling script execution in that user's web context.
Summary
What happened
Stored XSS in Gollum 5.0 through 5.1.1 allows remote attackers to execute JavaScript in another user's browser via a page filename. The Overview and Pages breadcrumb views interpolate filename-derived path elements into HTML without escaping, so an event-handler payload becomes executable markup. Exploitation requires a user to view a page listing or breadcrumb containing the attacker-created filename, enabling script execution in that user's web context.
The record
- CVE
- CVE-2020-35305
- Published
- Jul 15, 2022
- Updated
- Jul 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 15, 2022CVE publishedPublication date reported by the CVE source.
- Jul 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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
- Upstream malicious-filename XSS reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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