Cross-site scripting via unsanitized PHP_SELF
Published Dec 13, 2022 · Updated Dec 15, 2025
Cross-site scripting in PHP-Calendar 2.0.13 and earlier allows remote attackers to execute script in a victim's browser via crafted PHP_SELF requests. In index.php, the application places the attacker-influenced $_SERVER['PHP_SELF'] value into the $phpc_script variable with inadequate output escaping, permitting reflected payloads. Exploitation requires a victim to load the crafted URL; the consequence is script execution in that victim's browser context rather than server-side code execution.
Summary
What happened
Cross-site scripting in PHP-Calendar 2.0.13 and earlier allows remote attackers to execute script in a victim's browser via crafted PHP_SELF requests. In index.php, the application places the attacker-influenced $_SERVER['PHP_SELF'] value into the $phpc_script variable with inadequate output escaping, permitting reflected payloads. Exploitation requires a victim to load the crafted URL; the consequence is script execution in that victim's browser context rather than server-side code execution.
The record
- CVE
- CVE-2022-4455
- Published
- Dec 13, 2022
- Updated
- Dec 15, 2025
- Vendor
- Sean Proctor
- Product
- PHP-Calendar
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 13, 2022CVE publishedPublication date reported by the CVE source.
- Dec 15, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.0.0
- Affected versionversion=2.0.1
- Affected versionversion=2.0.10
- Affected versionversion=2.0.11
- Affected versionversion=2.0.12
- Affected versionversion=2.0.13
- Affected versionversion=2.0.2
- Affected versionversion=2.0.3
- Affected versionversion=2.0.4
- Affected versionversion=2.0.5
- Affected versionversion=2.0.6
- Affected versionversion=2.0.7
- Affected versionversion=2.0.8
- Affected versionversion=2.0.9
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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