CVE-2026-21853 - Vulnerability Analysis

Overview

AFFiNE < 0.25.4 contains a remote code execution caused by processing specially crafted affine: URLs in the custom URL handler, letting attackers execute arbitrary code remotely via crafted links, exploit requires victim interaction or automatic redirect.

Severity & Score

Impact

Attackers can execute arbitrary code on victim machines remotely, leading to full system compromise.

Mitigation

Update to version 0.25.4 or later.

References

• https://github.com/toeverything/AFFiNE/commit/c9a4129a3e9376b688c18e1dcd6c87a775caac80
• https://github.com/toeverything/AFFiNE/pull/13864
• https://github.com/toeverything/AFFiNE/security/advisories/GHSA-67vm-2mcj-8965

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Mar 2, 2026

🟠 CVE-2026-21853 - High (8.8) 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 websit... 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-21853/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

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