AFFiNE: One-click Remote Code Execution through Custom URL Handling

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Summary

CVECVE-2026-21853
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-02 19:16:32 UTC
Updated2026-04-20 14:53:37 UTC
DescriptionAFFiNE 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.002490000 probability, percentile 0.481840000 (date 2026-04-21)

Problem Types: CWE-94 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Affine Affine All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Toeverything AFFiNE affected < 0.25.4 Not specified

References

ReferenceSourceLinkTags
github.com/toeverything/AFFiNE/security/advisories/GHSA-67vm-2mcj-8965 [email protected] github.com Exploit, Third Party Advisory
github.com/toeverything/AFFiNE/commit/c9a4129a3e9376b688c18e1dcd6c87a775... [email protected] github.com Patch
github.com/toeverything/AFFiNE/pull/13864 [email protected] github.com Patch
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