# CVE-2026-52774: YesWiki reflected XSS in Bazar widget id parameter

Source: https://junglewise.ai/threats/cve-2026-52774-yeswiki-reflected-xss-in-bazar-widget-id-parameter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-05. Updated: 2026-07-09  
License: CC BY 4.0 with a link back

CVE-2026-52774 · Severity: medium · CVSS 6.1 · Published 2026-09-05

YesWiki, a collaborative wiki platform, contains a security flaw in its Bazar widget component. An attacker can send a specially crafted link to a user that, when clicked, executes malicious code in their web browser. This could allow the attacker to steal sensitive session information or perform unauthorized actions on behalf of the user, regardless of whether the user is logged in.

Technologies: [yeswiki/yeswiki (Packagist)](https://junglewise.ai/threats/technologies/yeswiki-yeswiki), [YesWiki](https://junglewise.ai/threats/technologies/yeswiki). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist), [YesWiki](https://junglewise.ai/threats/vendors/yeswiki).

## Quick answers

**Is CVE-2026-52774 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-52774 being exploited in the wild.

**How severe is CVE-2026-52774?** Medium severity, with a CVSS score of 6.1, 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-2026-52774?** 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-2026-52774 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-52774?** 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

  ```sh
  composer require yeswiki/yeswiki:^4.6.6
  ```


## Technical details

A reflected Cross-Site Scripting (XSS) vulnerability exists in YesWiki's Bazar extension. The vulnerability is located in the `__WidgetHandler.php` and the corresponding template `widget.tpl.html`, where the `id` GET parameter is processed using only `strip_tags()`. Because `strip_tags()` does not escape double quotes, an attacker can break out of HTML attributes like `data-formid` and `data-iframeUrl` to inject arbitrary event handlers (e.g., `onmouseover`). The exploit requires no authentication or valid page permissions and can be triggered by a remote attacker via a crafted URL. The issue is fixed in version 4.6.6.

## Affected products

- YesWiki yeswiki < 4.6.6

## Identifiers

- CVE-2026-52774
- GHSA-r5xw-gcgw-hwp5

## Timeline

- 2026-06-02: disclosed: Initial disclosure to vendor
- 2026-07-09: advisory: GitHub Advisory published
- 2026-07-09: patched: Fix released in version 4.6.6

## References

- [https://api.github.com/users/hash3liZer](https://api.github.com/users/hash3liZer)
- [https://github.com/hash3liZer](https://github.com/hash3liZer)
- [https://api.github.com/users/hash3liZer/gists%7B/gist_id%7D](https://api.github.com/users/hash3liZer/gists%7B/gist_id%7D)
- [https://api.github.com/users/hash3liZer/repos](https://api.github.com/users/hash3liZer/repos)
- [https://avatars.githubusercontent.com/u/29171692?v=4](https://avatars.githubusercontent.com/u/29171692?v=4)
- [https://api.github.com/users/hash3liZer/events%7B/privacy%7D](https://api.github.com/users/hash3liZer/events%7B/privacy%7D)

## Related threats

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- [YesWiki server-side request forgery in Bazar CSV import](https://junglewise.ai/threats/cve-2026-116827-yeswiki-before-4-7-0-contains-a-server-side-request-forgery)
- [YesWiki server-side request forgery in DuplicationManager](https://junglewise.ai/threats/cve-2026-116826-yeswiki-before-4-7-0-contains-a-server-side-request-forgery)
- [YesWiki HTTP Signature replay protection missing in ActivityPub inbox](https://junglewise.ai/threats/cve-2026-116825-yeswiki-from-4-6-2-before-4-7-0-lacks-replay-protection-in)
- [YesWiki stored cross-site scripting in referrers_sites handler](https://junglewise.ai/threats/cve-2026-116824-yeswiki-before-4-7-0-contains-a-stored-cross-site-scripting)