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CVE-2026-59728— @astrojs/rss: XML Injection via Unescaped RSS Feed Fields

Quick assessment

Affected
withastro astro
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.

withastro astro是withastro的框架。 withastro astro 1.0.0版本至4.0.18版本存在输入验证错误漏洞，该漏洞源于source.title和enclosure.type字段在XML模板中直接插值，未进行XML字符转义，可能导致攻击者注入任意XML，破坏feed结构并注入虚假元数据。

CVSS 4.3 · Medium EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
withastro astro >= 1.0.0, < 4.0.19 affected
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I. Basic Information for CVE-2026-59728

Vulnerability Information
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Vulnerability Title
@astrojs/rss: XML Injection via Unescaped RSS Feed Fields
Source: CVE Program / CVE List V5
Vulnerability Description
Astro is a web framework for content-driven websites. In versions 1.0.0 through 4.0.18, the source.title and enclosure.type item fields in packages/astro-rss/src/index.ts are interpolated directly into XML template strings without XML-character escaping before being parsed by fast-xml-parser. Both fields are validated only as z.string(), placing no restriction on XML special characters. An attacker who controls these values can inject arbitrary XML into the generated RSS feed: a value containing " can break out of an attribute (as with enclosure.type), and a value containing </source> can close an element early and inject additional nodes (as with source.title). This corrupts feed structure, injects false metadata (for example, a fake <link> pointing to a malicious URL), and can cause feed readers to misparse or display attacker-controlled content. In SSR mode (output: 'server'), the poisoned feed is served on every request to all subscribers. This issue has been fixed in version 4.0.19.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5
Vulnerability Title
withastro astro 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
withastro astro是withastro的框架。 withastro astro 1.0.0版本至4.0.18版本存在输入验证错误漏洞，该漏洞源于source.title和enclosure.type字段在XML模板中直接插值，未进行XML字符转义，可能导致攻击者注入任意XML，破坏feed结构并注入虚假元数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro >= 1.0.0, < 4.0.19 -

II. Public POCs for CVE-2026-59728

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III. Intelligence Information for CVE-2026-59728

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Patches & Fixes for CVE-2026-59728 (2)

Vendor Advisories for CVE-2026-59728 (1)

Vendor Pages for CVE-2026-59728 (1)

Same Patch Batch · withastro · 2026-07-27 · 4 CVEs total

CVE-2026-59729 5.1 MEDIUM Astro: XSS via unescaped spread attribute names in renderHTMLElement (incomplete fix for C
CVE-2026-59727 2.1 LOW Astro: Cross-site scripting via unescaped transition:* directive values on hydrated island
CVE-2026-59730 2.1 LOW @astrojs/node: Backslash-prefixed paths not recognized as internal by trailing-slash redir

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-91

V. Comments for CVE-2026-59728

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