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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Affine | Affine | < 0.25.4 |
Related Weaknesses (CWE)
References
- https://github.com/toeverything/AFFiNE/commit/c9a4129a3e9376b688c18e1dcd6c87a775Patch
- https://github.com/toeverything/AFFiNE/pull/13864Patch
- https://github.com/toeverything/AFFiNE/security/advisories/GHSA-67vm-2mcj-8965ExploitThird Party Advisory
FAQ
What is CVE-2026-21853?
CVE-2026-21853 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 embedd...
How severe is CVE-2026-21853?
CVE-2026-21853 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-21853?
Check the references section above for vendor advisories and patch information. Affected products include: Affine Affine.