CVE-2025-61682: Mediawiki/semantic media wiki Cross-Site Scripting Vulnerability
HIGHCVE-2025-61682 is a HIGH (CVSS 8.6) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Mediawiki/semantic media wiki libraries in the Packagist ecosystem. The issue involves semantic mediawiki vulnerable to stored xss through wikitext via improper use of non-reserved data attributes. Remediation is available by upgrading affected packages to version 7.0.0.
CVE-2025-61682 at a Glance
Security Impact
CVSS: 8.6
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L).
How to Fix CVE-2025-61682
To remediate this vulnerability, upgrade all affected Mediawiki/semantic media wiki dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade mediawiki/semantic-media-wiki to 7.0.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for mediawiki/semantic-media-wikiHow to Check if You Are Affected
To determine whether your application is affected by CVE-2025-61682, inspect your project dependencies for Mediawiki/semantic media wiki:
inspect dependencies for mediawiki/semantic-media-wikiAnalyze the terminal output to locate any version of Mediawiki/semantic media wiki in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.0.0), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Mediawiki/semantic media wiki, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-61682 Affected Mediawiki/semantic media wiki Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
mediawiki/semantic-media-wiki
|
Packagist |
≥ 3.1.0
< 7.0.0
|
7.0.0
|
References
Frequently Asked Questions
What is CVE-2025-61682?
Which Mediawiki/semantic media wiki versions are affected?
What version fixes CVE-2025-61682?
Is mediawiki/semantic-media-wiki affected?
What is the CVSS score of CVE-2025-61682?
What CWE is associated with CVE-2025-61682?
How can I check Packagist dependencies for CVE-2025-61682?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-hg8h-557g-q8pp",
"modified" : "2026-09-18T16:07:29Z",
"published" : "2026-09-18T16:07:29Z",
"aliases" : [ "CVE-2025-61682" ],
"summary" : "Semantic MediaWiki vulnerable to stored XSS through wikitext via improper use of non-reserved data attributes",
"details" : "### Summary\nThe SemanticMediaWiki extension inserts the unsanitized value of a data attribute into the DOM as HTML, allowing for stored XSS through wikitext.\n\n### Details\n\nIn `ext.smw.js`, the `data-subtab` attribute of all elements with the `smw-subtab` class is parsed as JSON and appended to the `innerHTML` of the element:\nhttps://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/62f1fa765b626e21d88999b97a3e8029db9fd385/res/smw/ext.smw.js#L37-L42\nHowever, most data attributes (except for reserved ones) like `data-subtab` can be used in wikitext. Therefore, it is possible to insert arbitrary HTML and JS through wikitext.\nThe decoded (`\"` will turn to `"`, but it will be decoded when it is retrieved through `.dataset`) value of the `data-subtab` attribute in the payload is `\"<img src='' onerror=alert(1)>\"`. This is valid JSON and returns a string with `<img src='' onerror=alert(1)>` when being decoded.\n\n### PoC\n\n1. Create a page with the following contents:\n```html\n{{#tag:div|\n|class=smw-subtab\n|data-subtab=\"\"<img src='' onerror=alert(1)>\"\"\n}}\n```\n2. Visit the page\n\n<img width=\"991\" height=\"465\" alt=\"image\" src=\"https://github.com/user-attachments/assets/5d28d852-72d6-41dc-a59a-faac1610015f\" />\n<img width=\"497\" height=\"69\" alt=\"image\" src=\"https://github.com/user-attachments/assets/02309390-0b40-46d9-b690-de8cd25dba59\" />\n\n### Impact\n\nArbitrary HTML can be inserted into the DOM by any user with the `edit` right, allowing for JavaScript to be executed.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Packagist",
"name" : "mediawiki/semantic-media-wiki"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.1.0"
}, {
"fixed" : "7.0.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-hg8h-557g-q8pp"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/SemanticMediaWiki/SemanticMediaWiki"
}, {
"type" : "WEB",
"url" : "https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.0.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-79" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-18T16:07:29Z",
"nvd_published_at" : null
}
}