How severe is CVE-2013-1421?

CVE-2013-1421 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-1421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-1421?

CVE-2013-1421 primarily affects Webcalendar Project Webcalendar. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-1421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-1421 published?

CVE-2013-1421 was published on 2014-04-22 and last updated on 2026-06-16.

CVE-2013-1421

CVE-2013-1421 is a medium-severity vulnerability in Webcalendar Project Webcalendar with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Webcalendar Project Webcalendar
Published: 2014-04-22
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in Craig Knudsen WebCalendar before 1.2.5, 1.2.6, and other versions before 1.2.7 allows remote attackers to inject arbitrary web script or HTML via the Category Name field to category.php.

Frequently asked questions

What is CVE-2013-1421?: Cross-site scripting (XSS) vulnerability in Craig Knudsen WebCalendar before 1.2.5, 1.2.6, and other versions before 1.2.7 allows remote attackers to inject arbitrary web script or HTML via the Category Name field to category.php.
How severe is CVE-2013-1421?: CVE-2013-1421 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-1421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-1421?: CVE-2013-1421 primarily affects Webcalendar Project Webcalendar. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-1421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-1421 published?: CVE-2013-1421 was published on 2014-04-22 and last updated on 2026-06-16.

References

Affected products (16)

cpe:2.3:a:webcalendar_project:webcalendar:*:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.0:rc2:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.0:rc3:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.1.6:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.2:b1:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:webcalendar_project:webcalendar:1.2.6:*:*:*:*:*:*:*

More vulnerabilities in Webcalendar Project Webcalendar

CVE-2012-1495 — Critical (CVSS 9.8): install/index.php in WebCalendar before 1.2.5 allows remote attackers to execute arbitrary code via the…
CVE-2012-1496 — High (CVSS 8.8): Local file inclusion in WebCalendar before 1.2.5.
CVE-2012-5385 — High (CVSS 7.5): install/index.php in Craig Knudsen WebCalendar before 1.2.5 allows remote attackers to modify settings.php and possibly…
CVE-2024-22635 — Medium (CVSS 6.1): WebCalendar v1.3.0 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the component…
CVE-2017-10840 — Medium (CVSS 6.1): Cross-site scripting vulnerability in WebCalendar 1.2.7 and earlier allows an attacker to inject arbitrary web script…
CVE-2023-0289 — Medium (CVSS 5.4): Cross-site Scripting (XSS) - Stored in GitHub repository craigk5n/webcalendar prior to master.

All CVEs affecting Webcalendar Project Webcalendar →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →