CVE-2021-36551

Name: CVE-2021-36551
Creator: NVD / NIST
Published: 2021-10-28T20:15:07.627+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2021-36551 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. TikiWiki v21.4 was discovered to contain a cross-site scripting (XSS) vulnerability in the component tiki-calendar.php. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload under the Add Event module.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

TikiWiki v21.4 was discovered to contain a cross-site scripting (XSS) vulnerability in the component tiki-calendar.php. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload under the Add Event module.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.49%

38.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Tiki	Tikiwiki Cms\/Groupware	21.4

References

https://github.com/r0ck3t1973/xss_payload/issues/7Exploit, Issue Tracking, Third Party Advisory
https://github.com/r0ck3t1973/xss_payload/issues/7Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Oct 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36551?

How severe is CVE-2021-36551?

CVE-2021-36551 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36551?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36551?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST