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CVE-2026-77616— Semantic MediaWiki affected by reflected XSS in `Special:Ask` via a forged cursor pagination token

Quick assessment

Affected
SemanticMediaWiki SemanticMediaWiki
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Semantic MediaWiki 是 MediaWiki 的一个免费开源扩展，允许用户在 Wiki 页面中存储和查询数据。在 7.0.0 至 7.1.0 版本中， 接受用于键集分页（keyset pagination）的 查询参数（该功能在 7.0.0 中引入）。该令牌由 解码，它是一个无符号的 base64url 编码的 JSON 数据块，因此其内容完全受攻击者控制。当游标的排序锚点与请求中的 / 不匹配时， 会通过 将攻击者控制的 / 值直接插入到原始字符串中以构建错误消息。与 SMW 基于消息键的错误不同

CVSS 6.1 · Medium EPSS 0.33% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
SemanticMediaWiki SemanticMediaWiki >= 7.0.0, < 7.2.0 affected
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I. Basic Information for CVE-2026-77616

Vulnerability Information
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Vulnerability Title
Semantic MediaWiki affected by reflected XSS in `Special:Ask` via a forged cursor pagination token
Source: CVE Program / CVE List V5
Vulnerability Description
Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. In versions 7.0.0 through 7.1.0, `Special:Ask` accepts a `cursor` query parameter for keyset pagination (added in 7.0.0). The token is decoded by `CursorEncoder`, which is an **unsigned** base64url-encoded JSON blob, so its contents are fully attacker-controlled. When the cursor's sort anchor does not match the request's `sort=` / `order=`, `QueryCreator::applyCursorIfRequested()` builds an error message by interpolating the attacker-controlled `sort_prop` / `sort_order` values into a raw string via `Query::addErrors()`. Unlike SMW's message-key errors, this raw string bypasses the message layer's sanitization (`ProcessingErrorMsgHandler::normalizeAndDecodeMessages()` passes a non-key, non-encoded string through unchanged). `ErrorWidget::queryError()` then assembles the errors and passes them to `Html::errorBox()`, whose first argument is emitted as raw HTML. The result is a reflected cross-site scripting vulnerability: a crafted `cursor` token containing markup in `sort_prop` (or `sort_order`) executes script in the victim's browser on the wiki origin. No authentication or special permission is required. The payload is delivered via a crafted link. Version 7.2.0 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SemanticMediaWiki SemanticMediaWiki >= 7.0.0, < 7.2.0 -

II. Public POCs for CVE-2026-77616

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III. Intelligence Information for CVE-2026-77616

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Other References for CVE-2026-77616 (2)

Same Patch Batch · SemanticMediaWiki · 2026-09-18 · 7 CVEs total

CVE-2025-61682 8.6 HIGH Semantic MediaWiki vulnerable to stored XSS through wikitext via improper use of non-reser
CVE-2026-77606 6.1 MEDIUM Semantic MediaWiki has reflected XSS in Special:Ask plain table headers
CVE-2026-77609 6.1 MEDIUM Semantic MediaWiki has an open redirect in Special:URIResolver
CVE-2026-77607 6.1 MEDIUM Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS
CVE-2026-77608 6.1 MEDIUM Semantic MediaWiki has reflected XSS in `Special:SearchByProperty` (`property` and `value`
CVE-2026-77610 6.1 MEDIUM Semantic MediaWiki has a query debug output XSS (`DebugFormatter`)

IV. Related Vulnerabilities

Same product: SemanticMediaWiki
Same vendor: SemanticMediaWiki
Same weakness: CWE-79