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CVE-2026-25808— Hollo DMs get leaked and can be seen on Webfinger Browser

Quick assessment

Affected
fedify-dev hollo
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.

Hollo是Fedify开源的一个微型博客软件。 Hollo 0.6.20之前版本和0.7.2之前版本存在安全漏洞，该漏洞源于私信和仅限关注者可见的帖子通过ActivityPub发件箱端点暴露，可能导致信息泄露。

CVSS 7.5 · High EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-25808

Vulnerability Information
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Vulnerability Title
Hollo DMs get leaked and can be seen on Webfinger Browser
Source: CVE Program / CVE List V5
Vulnerability Description
Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Prior to 0.6.20 and 0.7.2, there is a security vulnerability where DMs and followers-only posts were exposed through the ActivityPub outbox endpoint without authorization. This vulnerability is fixed in 0.6.20 and 0.7.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Hollo 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hollo是Fedify开源的一个微型博客软件。 Hollo 0.6.20之前版本和0.7.2之前版本存在安全漏洞，该漏洞源于私信和仅限关注者可见的帖子通过ActivityPub发件箱端点暴露，可能导致信息泄露。
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
fedify-dev hollo < 0.6.20, 0.7.2 -

II. Public POCs for CVE-2026-25808

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III. Intelligence Information for CVE-2026-25808

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IV. Related Vulnerabilities

Same product: hollo
Same vendor: fedify-dev
Same weakness: CWE-862

V. Comments for CVE-2026-25808

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