YesWiki before 4.6.7 contains a cross-site scripting vulnerability in the Bazar valeur action that allows page editors to inject script by rendering unescaped HTML fetched from a remote URL. Attackers can point tools/bazar/actions/valeur.php at a controlled server returning BAZ_fiche_titre markup with an img onerror handler, executing script in every viewer's browser.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/YesWiki/yeswiki/commit/22a5260b0381824e01d340ce9457c4adb9e18…
disclosure@vulncheck.com
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-6rvf-7pwm-6j44
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-stored-xss-via-bazar-…
disclosure@vulncheck.com