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CVE-2026-21853— AFFiNE: One-click Remote Code Execution through Custom URL Handling

Quick assessment

Affected
toeverything AFFiNE
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AFFiNE.Pro是Toeverything开源的一个下一代知识库。 AFFiNE.Pro 0.25.4之前版本存在代码注入漏洞，该漏洞源于特制affine:URL可导致一键远程代码执行。

CVSS 8.8 · High EPSS 0.62% · P48
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I. Basic Information for CVE-2026-21853

Vulnerability Information
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Vulnerability Title
AFFiNE: One-click Remote Code Execution through Custom URL Handling
Source: CVE Program / CVE List V5
Vulnerability Description
AFFiNE is an open-source, all-in-one workspace and an operating system. Prior to version 0.25.4, there is a one-click remote code execution vulnerability. This vulnerability can be exploited by embedding a specially crafted affine: URL on a website. An attacker can trigger the vulnerability in two common scenarios: 1/ A victim visits a malicious website controlled by the attacker and the website redirect to the URL automatically, or 2/ A victim clicks on a crafted link embedded on a legitimate website (e.g., in user-generated content). In both cases, the browser invokes AFFiNE custom URL handler, which launches the AFFiNE app and processes the crafted URL. This results in arbitrary code execution on the victim’s machine, without further interaction. This issue has been patched in version 0.25.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
AFFiNE.Pro 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AFFiNE.Pro是Toeverything开源的一个下一代知识库。 AFFiNE.Pro 0.25.4之前版本存在代码注入漏洞，该漏洞源于特制affine:URL可导致一键远程代码执行。
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
toeverything AFFiNE < 0.25.4 -

II. Public POCs for CVE-2026-21853

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5470 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-21853

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Patches & Fixes for CVE-2026-21853 (2)

Vendor Advisories for CVE-2026-21853 (1)

IV. Related Vulnerabilities

Same product: AFFiNE
Same vendor: toeverything
Same weakness: CWE-94

V. Comments for CVE-2026-21853

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