In TestLink 1.9.20, the lib/cfields/cfieldsExport.php goback_url parameter causes a security risk because it depends on client input and is not constrained to lib/cfields/cfieldsView.php at the web site associated with the session.

In TestLink 1.9.20, a crafted login.php viewer parameter exposes cleartext credentials.

TestLink before 1.9.20 allows XSS via non-lowercase javascript: in the index.php reqURI parameter. NOTE: this issue exists because of an incomplete fix for CVE-2019-19491.

Multiple SQL injection vulnerabilities in TestLink through 1.9.19 allows remote authenticated users to execute arbitrary SQL commands via the (1) tproject_id parameter to keywordsView.php; the (2) req_spec_id parameter to reqSpecCompareRevisions.php; the (3) requirement_id parameter to reqCompareVersions.php; the (4) build_id parameter to planUpdateTC.php; the (5) tplan_id parameter to newest_tcversions.php; the (6) tplan_id parameter to tcCreatedPerUserGUI.php; the (7) tcase_id parameter to tcAssign2Tplan.php; or the (8) testcase_id parameter to tcCompareVersions.php. Authentication is often easy to achieve: a guest account, that can execute this attack, can be created by anyone in the default configuration.

TestLink 1.9.19 has XSS via the lib/testcases/archiveData.php edit parameter, the index.php reqURI parameter, or the URI in a lib/testcases/tcEdit.php?doAction=doDeleteStep request.

TestLink 1.9.19 has XSS via the error.php message parameter.

TestLink through 1.9.16 allows remote attackers to read arbitrary attachments via a modified ID field to /lib/attachments/attachmentdownload.php.

install/installNewDB.php in TestLink through 1.9.16 allows remote attackers to conduct injection attacks by leveraging control over DB LOGIN NAMES data during installation to provide a long, crafted value.

TestLink before v.1.9.20 is vulnerable to Cross Site Scripting (XSS) via the pop-up on upload file. When uploading a file, the XSS payload can be entered into the file name.