CVE-2025-25194— Server-Side Request Forgery (SSRF) in activitypub_federation
Quick assessment
Affected
LemmyNet lemmy
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.
Lemmy是Lemmy开源的一款用于构建社交新闻聚合器和网络论坛的自由软件。 Lemmy 0.19.8及之前版本存在代码问题漏洞，该漏洞源于activitypub_federation中依赖项未正确处理Webfinger请求，导致服务端请求伪造。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1187 · Forced Authentication
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I. Basic Information for CVE-2025-25194
Vulnerability Information
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Vulnerability Title
Server-Side Request Forgery (SSRF) in activitypub_federation
Source: CVE Program / CVE List V5
Vulnerability Description
Lemmy, a link aggregator and forum for the fediverse, is vulnerable to server-side request forgery via a dependency on activitypub_federation, a framework for ActivityPub federation in Rust. This vulnerability, which is present in versions 0.6.2 and prior of activitypub_federation and versions 0.19.8 and prior of Lemmy, allows a user to bypass any predefined hardcoded URL path or security anti-Localhost mechanism and perform an arbitrary GET request to any Host, Port and URL using a Webfinger Request. As of time of publication, a fix has not been made available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Lemmy 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lemmy是Lemmy开源的一款用于构建社交新闻聚合器和网络论坛的自由软件。 Lemmy 0.19.8及之前版本存在代码问题漏洞，该漏洞源于activitypub_federation中依赖项未正确处理Webfinger请求，导致服务端请求伪造。
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
II. Public POCs for CVE-2025-25194
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Vendor Advisories for CVE-2025-25194 (1)
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V. Comments for CVE-2025-25194
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