Credential phishing via unprotected SVG uploads
Published Feb 6, 2026 · Updated Feb 6, 2026
Cross-site scripting in HedgeDoc before 1.10.6 allows remote attackers to host malicious SVG content through the /uploads/ endpoint. The /uploads middleware ran after express.static, so static responses bypassed the intended Content-Disposition and restrictive Content-Security-Policy headers. An affected instance must use the filesystem media backend, and exploitation requires a victim to follow a direct upload link; the content can impersonate a login page and submit entered data externally.
Summary
What happened
Cross-site scripting in HedgeDoc before 1.10.6 allows remote attackers to host malicious SVG content through the /uploads/ endpoint. The /uploads middleware ran after express.static, so static responses bypassed the intended Content-Disposition and restrictive Content-Security-Policy headers. An affected instance must use the filesystem media backend, and exploitation requires a victim to follow a direct upload link; the content can impersonate a login page and submit entered data externally.
The record
- CVE
- CVE-2026-25642
- Published
- Feb 6, 2026
- Updated
- Feb 6, 2026
- Vendor
- HedgeDoc
- Product
- HedgeDoc
- Classifications
- CWE-79, T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 6, 2026CVE publishedPublication date reported by the CVE source.
- Feb 6, 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=< 1.10.6
What conditions does exploitation require?
What is affected?
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
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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