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CVE-2025-1781

Quick assessment

Affected
W3C CSS Validator
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.

CSS Validator是美国万维网（W3C）组织的一款CSS（层叠样式表）验证程序。 CSS Validator cssval-20250226之前版本存在安全漏洞，该漏洞源于允许攻击者使用特制XML对象强制服务器端请求伪造，可能读取任意本地文件。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.38% · P31
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I. Basic Information for CVE-2025-1781

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
There is a XXE in W3CSS Validator versions before cssval-20250226 that allows an attacker to use specially-crafted XML objects to coerce server-side request forgery (SSRF).  This could be exploited to read arbitrary local files if an attacker has access to exception messages.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
CSS Validator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CSS Validator是美国万维网（W3C）组织的一款CSS（层叠样式表）验证程序。 CSS Validator cssval-20250226之前版本存在安全漏洞，该漏洞源于允许攻击者使用特制XML对象强制服务器端请求伪造，可能读取任意本地文件。
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
W3C CSS Validator < cssval-20250226 -

II. Public POCs for CVE-2025-1781

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III. Intelligence Information for CVE-2025-1781

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IV. Related Vulnerabilities

Same product: CSS Validator
Same vendor: W3C
Same weakness: CWE-611

V. Comments for CVE-2025-1781

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