CVE-2026-52772: 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.

CVE-2026-52772 · Severity: medium · CVSS 5.5 · Published 2026-09-05

YesWiki, a collaborative wiki platform, contains a vulnerability in its Bazar form-building component. A user with administrative or form-editing privileges can inject malicious scripts into form field labels or hints. When other users, including regular visitors, view these forms, the script executes in their browser, potentially allowing the attacker to steal session cookies, hijack accounts, or modify site content.

Technologies: yeswiki/yeswiki (Packagist), YesWiki. Vendors: Packagist, YesWiki.

Quick answers

Is CVE-2026-52772 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-52772 being exploited in the wild.
How severe is CVE-2026-52772?
Medium severity, with a CVSS score of 5.5, published 5 September 2026.
Which products and versions are affected?
yeswiki/yeswiki (Packagist) < 4.6.6, ECOSYSTEM:introduced=0,fixed=4.6.6; YesWiki < 4.6.6.
Is there a fix for CVE-2026-52772?
Yes. yeswiki/yeswiki (Packagist): upgrade to 4.6.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-52772 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-52772?
Check whether you run yeswiki/yeswiki (Packagist) or YesWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • yeswiki/yeswiki (Packagist): upgrade to 4.6.6 or later
    composer require yeswiki/yeswiki:^4.6.6

Technical details

A stored XSS vulnerability exists in YesWiki's Bazar component due to the use of the Twig `|raw` and `|raw('html')` filters on user-controlled `field.label` and `field.hint` variables. While a partial fix was previously implemented, several templates (including base layouts like `layouts/input.twig`) remain affected. The vulnerability occurs in three contexts: attribute breakout in placeholders, tooltip injection in `title`/`alt` attributes, and direct DOM injection in label bodies. An attacker with `saisie_formulaire` permissions (typically admins) can inject arbitrary JavaScript. The issue is exacerbated by `BazarField.php` using `html_entity_decode` on labels, which bypasses standard entity-encoding mitigations. The vulnerability was patched in version 4.6.6 by removing the `raw` filters to allow Twig's auto-escaping to function correctly.

Affected products

  • YesWiki YesWiki < 4.6.6

Identifiers

  • CVE-2026-52772
  • GHSA-xc7j-3g8q-9vh4

Timeline

  • 2026-05-19: other: Partial fix attempted in commit e6b66aa
  • 2026-06-02: advisory: GitHub Advisory published
  • 2026-07-09: patched: Vulnerability confirmed patched in version 4.6.6

References

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