CVE-2026-34598

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, there is an authenticated PHP object injection vulnerability in BazarImportAction via unserialize. This issue has been patched in version 4.6.6.

YesWiki prior to version 4.6.6 has a vulnerability in the {{erasespamedcomments}} wiki action that deletes arbitrary wiki pages without authorization based on a suppr[] array from POST. The default ACL model allows any user with write access to delete pages, including the front page and admin pages.

YesWiki before 4.6.4 has an unauthenticated SQL injection in the Bazar form-import path, allowing any visitor to inject arbitrary SQL into an INSERT statement and read the full database, including password hashes.

YesWiki before version 4.6.6 contains an unsafe execution vulnerability in the Bazar form field calculator (CalcField.php), where the application attempts to sanitize mathematical formulas using a complex regular expression before passing them to eval(), which is vulnerable to ReDoS and can lead to arbitrary PHP code execution.

YesWiki prior to version 4.6.6 contains a SQL injection vulnerability in ReactionManager::deleteUserReaction() that allows any authenticated user to inject arbitrary SQL via the {idreaction} and {id} URL path parameters. The parameters are concatenated directly into a SQL LIKE clause without escaping or parameterization.

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, YesWiki's Bazar widget handler reflects the id GET parameter into HTML attributes using strip_tags() only. Because strip_tags() does not escape double quotes, an attacker can break out of the attribute value, inject an event handler such as onmouseover, and execute arbitrary JavaScript in the victim's browser. This issue is reachable without authentication.

YesWiki is a wiki system written in PHP. From version 4.1.0 to before version 4.6.6, YesWiki's archived-revision view reflects the time GET parameter into a hidden HTML input in handlers/page/show.php without escaping. Because MySQL coerces malformed DATETIME strings, an attacker can append HTML or JavaScript to a valid archived revision timestamp, still load that archived revision, and execute arbitrary JavaScript in the victim's browser. The vulnerable form is only rendered when the victim can both read and edit the target page.

YesWiki is a wiki system written in PHP. Prior to version 4.6.6, Bazar form-field templates still apply |raw('html') to field.label / field.hint in attribute and label-body contexts, resulting stored XSS in form renders.

YesWiki from version 4.2.0 to before 4.6.6 has a SQL injection vulnerability in ApiController::deletePage(), where a page tag retrieved from the database is interpolated into a DELETE query without escaping. A low-privilege authenticated user can create a page with a tag that is a SQL fragment and execute arbitrary SQL in the wiki database.

YesWiki prior to version 4.6.6 has an unauthenticated SQL injection vulnerability in public Bazar entry-listing APIs, in numeric query filters. The filter value is escaped but inserted into SQL without quotes or numeric validation, allowing an attacker to inject boolean expressions and infer database contents.