CVE-2026-52774 (GCVE-0-2026-52774)
Vulnerability from cvelistv5 – Published: 2026-09-04 23:51 – Updated: 2026-09-08 13:05
VLAI
EPSS
VEX
Title
Reflected XSS via Unescaped `id` Parameter in Bazar Widget HTML Attributes in YesWiki
Summary
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. During validation, the vulnerable widget route returned the injected HTML for both /HomePage/widget?id=... and /NoSuchPage/widget?id=..., which shows that no login, no page ownership, no edit rights, and not even a valid page tag were required. The only routing prerequisite observed was that the Bazar extension is enabled and the request includes an id parameter. This issue has been patched in version 4.6.6.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 13:05 UTC
CWE
- CWE-80 - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/YesWiki/yeswiki/security/advis… | x_refsource_CONFIRM |
| https://github.com/YesWiki/yeswiki/commit/1aa2710… | x_refsource_MISC |
| https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6 | x_refsource_MISC |
Impacted products
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FKIE_CVE-2026-52774
Vulnerability from fkie_nvd - Published: 2026-09-05 00:17 - Updated: 2026-09-08 21:05
Severity
Summary
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. During validation, the vulnerable widget route returned the injected HTML for both /HomePage/widget?id=... and /NoSuchPage/widget?id=..., which shows that no login, no page ownership, no edit rights, and not even a valid page tag were required. The only routing prerequisite observed was that the Bazar extension is enabled and the request includes an id parameter. This issue has been patched in version 4.6.6.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "yeswiki",
"vendor": "YesWiki",
"versions": [
{
"status": "affected",
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}
]
}
],
"source": "security-advisories@github.com"
}
],
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}
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GHSA-R5XW-GCGW-HWP5
Vulnerability from github – Published: 2026-07-09 21:01 – Updated: 2026-07-09 21:01
VLAI
Summary
YesWiki Vulnerable to Reflected XSS via Unescaped `id` Parameter in Bazar Widget HTML Attributes
Details
Summary
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. During validation, the vulnerable widget route returned the injected HTML for both /HomePage/widget?id=... and /NoSuchPage/widget?id=..., which shows that no login, no page ownership, no edit rights, and not even a valid page tag were required. The only routing prerequisite observed was that the Bazar extension is enabled and the request includes an id parameter.
Details
The primary sink is in tools/bazar/presentation/templates/widget.tpl.html around lines 4-7, where $_GET['id'] is inserted into the data-formid attribute:
data-formid="<?php echo strip_tags($_GET['id']); ?>"
strip_tags() is not an output-encoding function. It removes HTML tags, but it does not escape characters such as double quotes, so an attacker can terminate the data-formid attribute and inject new attacker-controlled attributes.
The route is served by tools/bazar/handlers/__WidgetHandler.php around lines 14-26, which only checks whether $_GET['id'] is present:
if (!isset($_GET['id'])) {
return null;
}
No HasAccess('read'), HasAccess('write'), or authentication check is performed before the vulnerable template is rendered.
There is also a second reflection path in the same handler. The handler builds:
$urlParams = 'id=' . strip_tags($_GET['id']) . ...
and then places the resulting value into the widget template's data-iframeUrl attribute:
data-iframeUrl="<?php echo $GLOBALS['wiki']->href('bazariframe', '', $urlparams, false); ?>"
During validation, a single payload injected into id was reflected into both data-formid and data-iframeUrl, which confirms that the handler exposes multiple attribute-level sinks from the same unsafely handled input.
This issue maps to CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
PoC
- Set up a vulnerable YesWiki instance with the bundled Bazar extension enabled. This was validated locally on the official
doryphore 4.6.5release. - Confirm the minimum access requirements:
- No account is required.
- No
readorwritepermission on a specific page is required. - No valid existing page tag is required.
- No valid Bazar form identifier is required.
- The only observed requirements were that the Bazar widget handler is present and the request includes an
idparameter. - Request the widget handler with an attribute-breaking payload in
id, for example:
http://127.0.0.1:8085/NoSuchPage/widget?id=%22%20onmouseover=%22alert(1)%22%20x=%22
- Open the URL in a browser as an unauthenticated visitor.
- Observe that the server returns HTTP
200and renders the Bazar widget page even though the page tag is arbitrary. - Inspect the returned HTML. The response contains attacker-controlled attributes in the widget root element:
<div id="widgetapp" v-cloak
data-formid="" onmouseover="alert(1)" x=""
...
data-iframeUrl="http://127.0.0.1:8085/NoSuchPage/bazariframe&id=" onmouseover="alert(1)" x=""
>
- Move the mouse over the
widgetappelement or otherwise trigger the injected event handler. - The browser executes the injected JavaScript in the YesWiki origin.
Impact
This is a reflected XSS vulnerability in the Bazar widget handler with very low attacker prerequisites.
The practical access model is:
- The attacker only needs to send a crafted public URL.
- The victim does not need to authenticate.
- The attacker does not need edit rights, ownership, or a valid page tag.
- The route only needs to be reachable on a YesWiki instance with Bazar enabled.
An attacker may be able to:
- Execute arbitrary JavaScript in the victim's browser.
- Steal browser-accessible sensitive data.
- Perform actions in the victim's session if the victim is logged in.
- Target public visitors and authenticated users alike because the route is reachable without access-control checks.
Severity
6.1 (Medium)
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}
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}
],
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],
"database_specific": {
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],
"github_reviewed": true,
"github_reviewed_at": "2026-07-09T21:01:10Z",
"nvd_published_at": null,
"severity": "MODERATE"
},
"details": "### Summary\nYesWiki\u0027s 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\u0027s browser.\n\nThis issue is reachable without authentication. During validation, the vulnerable `widget` route returned the injected HTML for both `/HomePage/widget?id=...` and `/NoSuchPage/widget?id=...`, which shows that no login, no page ownership, no edit rights, and not even a valid page tag were required. The only routing prerequisite observed was that the Bazar extension is enabled and the request includes an `id` parameter.\n\n### Details\nThe primary sink is in `tools/bazar/presentation/templates/widget.tpl.html` around lines `4-7`, where `$_GET[\u0027id\u0027]` is inserted into the `data-formid` attribute:\n\n```php\ndata-formid=\"\u003c?php echo strip_tags($_GET[\u0027id\u0027]); ?\u003e\"\n```\n\n`strip_tags()` is not an output-encoding function. It removes HTML tags, but it does not escape characters such as double quotes, so an attacker can terminate the `data-formid` attribute and inject new attacker-controlled attributes.\n\nThe route is served by `tools/bazar/handlers/__WidgetHandler.php` around lines `14-26`, which only checks whether `$_GET[\u0027id\u0027]` is present:\n\n```php\nif (!isset($_GET[\u0027id\u0027])) {\n return null;\n}\n```\n\nNo `HasAccess(\u0027read\u0027)`, `HasAccess(\u0027write\u0027)`, or authentication check is performed before the vulnerable template is rendered.\n\nThere is also a second reflection path in the same handler. The handler builds:\n\n```php\n$urlParams = \u0027id=\u0027 . strip_tags($_GET[\u0027id\u0027]) . ...\n```\n\nand then places the resulting value into the widget template\u0027s `data-iframeUrl` attribute:\n\n```php\ndata-iframeUrl=\"\u003c?php echo $GLOBALS[\u0027wiki\u0027]-\u003ehref(\u0027bazariframe\u0027, \u0027\u0027, $urlparams, false); ?\u003e\"\n```\n\nDuring validation, a single payload injected into `id` was reflected into both `data-formid` and `data-iframeUrl`, which confirms that the handler exposes multiple attribute-level sinks from the same unsafely handled input.\n\nThis issue maps to **CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)**.\n\n### PoC\n1. Set up a vulnerable YesWiki instance with the bundled Bazar extension enabled. This was validated locally on the official `doryphore 4.6.5` release.\n2. Confirm the minimum access requirements:\n - No account is required.\n - No `read` or `write` permission on a specific page is required.\n - No valid existing page tag is required.\n - No valid Bazar form identifier is required.\n - The only observed requirements were that the Bazar widget handler is present and the request includes an `id` parameter.\n3. Request the widget handler with an attribute-breaking payload in `id`, for example:\n\n```text\nhttp://127.0.0.1:8085/NoSuchPage/widget?id=%22%20onmouseover=%22alert(1)%22%20x=%22\n```\n\n4. Open the URL in a browser as an unauthenticated visitor.\n5. Observe that the server returns HTTP `200` and renders the Bazar widget page even though the page tag is arbitrary.\n6. Inspect the returned HTML. The response contains attacker-controlled attributes in the widget root element:\n\n```html\n\u003cdiv id=\"widgetapp\" v-cloak\n data-formid=\"\" onmouseover=\"alert(1)\" x=\"\"\n ...\n data-iframeUrl=\"http://127.0.0.1:8085/NoSuchPage/bazariframe\u0026id=\" onmouseover=\"alert(1)\" x=\"\"\n\u003e\n```\n\n7. Move the mouse over the `widgetapp` element or otherwise trigger the injected event handler.\n8. The browser executes the injected JavaScript in the YesWiki origin.\n\n\u003cimg width=\"1600\" height=\"838\" alt=\"image\" src=\"https://github.com/user-attachments/assets/de592586-a6ee-48f4-bbde-137ab07aaa71\" /\u003e\n\n### Impact\nThis is a **reflected XSS** vulnerability in the Bazar widget handler with very low attacker prerequisites.\n\nThe practical access model is:\n\n- The attacker only needs to send a crafted public URL.\n- The victim does not need to authenticate.\n- The attacker does not need edit rights, ownership, or a valid page tag.\n- The route only needs to be reachable on a YesWiki instance with Bazar enabled.\n\nAn attacker may be able to:\n\n- Execute arbitrary JavaScript in the victim\u0027s browser.\n- Steal browser-accessible sensitive data.\n- Perform actions in the victim\u0027s session if the victim is logged in.\n- Target public visitors and authenticated users alike because the route is reachable without access-control checks.",
"id": "GHSA-r5xw-gcgw-hwp5",
"modified": "2026-07-09T21:01:10Z",
"published": "2026-07-09T21:01:10Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-r5xw-gcgw-hwp5"
},
{
"type": "WEB",
"url": "https://github.com/YesWiki/yeswiki/commit/1aa2710c7505630b858f2142a65f9441bfaba2b2"
},
{
"type": "PACKAGE",
"url": "https://github.com/YesWiki/yeswiki"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "YesWiki Vulnerable to Reflected XSS via Unescaped `id` Parameter in Bazar Widget HTML Attributes"
}
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.