Vulnerability · Published Mar 2, 2026 · Assigned by GitHub_M
CVE-2026-21853AFFiNE: One-click Remote Code Execution through Custom URL Handling
High 8.8
In plain English
A high-severity code injection in AFFiNE from toeverything. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| toeverything | AFFiNE | < 0.25.4 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/toeverything/AFFiNE/security/advisories/GHSA-67vm-2mcj-8965 x_refsource_CONFIRM
- https://github.com/toeverything/AFFiNE/pull/13864 x_refsource_MISC
- https://github.com/toeverything/AFFiNE/commit/c9a4129a3e9376b688c18e1dcd6c87a775caac80 x_refsource_MISC