CVE-2026-21853: AFFiNE is an open-source, all-in-one workspace and an operating system

Q: How do I fix CVE-2026-21853?

affine: upgrade to 0.25.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-21853 being exploited?

CVE-2026-21853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21853 affect?

CVE-2026-21853 affects affine. Severity is high (CVSS 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

Q: How urgent is CVE-2026-21853?

Priority 49/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-21853 is a high-severity flaw (CVSS 8.8) affecting affine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 c

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-03-02
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: affine

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-02 19:16 UTCPublished CVE record published
2026-06-17 10:19 UTCUpdated Record last modified

affine affine UPGRADE

Affected: < 0.25.4

Fixed in: 0.25.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy affine || rpm -q affine || affine --version

2. UPGRADE to 0.25.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade affine

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade affine

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21853?

affine: upgrade to 0.25.4. Exact commands for each OS are on this page.

Is CVE-2026-21853 being exploited?

CVE-2026-21853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21853 affect?

CVE-2026-21853 affects affine. Severity is high (CVSS 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

How urgent is CVE-2026-21853?

Priority 49/100. High severity; Public exploit reference

Related CVEs

CVE-2026-25477 MEDIUM 6.1 UPGRADE AFFiNE is an open-source, all-in-one workspace and an operating system

References

← Back to latest CVEs