CVE-2021-34667
Calendar_plugin <= 1.0 Reflected Cross-Site Scripting
The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Calendar_plugin <= 1.0 Reflected Cross-Site Scripting
The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.
- Record
CVE-2021-34667- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-21317
The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.
- Record
EUVD-2021-21317- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-r68r-w4gj-642m No score
The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the...
The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.
- Record
GHSA-r68r-w4gj-642m- Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
The Calendar_plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to the use of $_SERVER['PHP_SELF'] in the ~/calendar.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.
- Record
CVE-2021-34667- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-34667 is a medium vulnerability (CVSS 6.1) in Calendar Plugin Plugin, published August 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.90%, the 59th percentile. No source names a fixed version.