HOMEVULNERABILITIESCVE-2021-36550
MEDIUM

CVE-2021-36550

CWE-79Published: October 28, 2021· Updated: Jun 17, 2026

5.4
CVSS v3.1

Official Description

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

NVD Source

Technical Analysis

CVE-2021-36550 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeChanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected Vendors & Products

tiki1 product(s)
tikiwiki cms\/groupware
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
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Official Patches & Advisories

All References (2)

https://github.com/r0ck3t1973/xss_payload/issues/6Exploit · Issue Tracking · Third Party Advisory
https://github.com/r0ck3t1973/xss_payload/issues/6Exploit · Issue Tracking · Third Party Advisory

Quick Facts

CVE IDCVE-2021-36550
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-79
CISA KEVNo
Affected1 vendor(s)
PublishedOct 28, 2021

Related CVEs (CWE-79)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2021-36550 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.