What is CVE-2026-21853?

CVE-2026-21853 is a high-severity vulnerability in Toeverything Affine, classified under Code Injection. CVSS score: 8.8/10. Published 2026-03-02.

How severe is CVE-2026-21853?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Toeverything Affine

CVE-2026-21853

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…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (52.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Toeverything Affine — versions < 0.25.4

Weakness classification (CWE)

CWE-94 — Code Injection

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)

Frequently asked questions

What is CVE-2026-21853?: CVE-2026-21853 is a high-severity vulnerability in Toeverything Affine, classified under Code Injection. CVSS score: 8.8/10. Published 2026-03-02.
How severe is CVE-2026-21853?: High severity. CVSS v3 base score is 8.8 out of 10.