Browser script execution via unescaped p4 parameter
Published Sep 12, 2023 · Updated Jul 9, 2026
Reflected XSS in IceWarp Webmail Calendar 10.3.1 allows remote attackers to execute script in a user's browser through a crafted URL. The calendar event-list page renders the p4 query parameter as markup without neutralization, allowing an injected SVG onload handler to execute. A victim must open the attacker-controlled request; the script runs in the IceWarp origin and can read or modify data available to that victim.
Summary
What happened
Reflected XSS in IceWarp Webmail Calendar 10.3.1 allows remote attackers to execute script in a user's browser through a crafted URL. The calendar event-list page renders the p4 query parameter as markup without neutralization, allowing an injected SVG onload handler to execute. A victim must open the attacker-controlled request; the script runs in the IceWarp origin and can read or modify data available to that victim.
The record
- CVE
- CVE-2023-41013
- Published
- Sep 12, 2023
- Updated
- Jul 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 12, 2023CVE 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 is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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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
- Webmail Calendar p4 reflected-XSS proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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