Vulnerability · Published Nov 5, 2026 · Assigned by VulnCheck

CVE-2026-123206EdgeChat before 2.20.3 Missing Authentication for Attachment Download via GET /files/:key

Low 3.7

In plain English

A low-severity missing authentication in EdgeChat from aozorae. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low

Exploit odds (30 days)0.5%top 59.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

EdgeChat before 2.20.3 contains a missing authentication vulnerability in the GET /files/:key route that allows unauthenticated or banned users to download decrypted public-channel attachments because canAccessFile() accepts a null user id. Attackers holding an attachment object key can omit or supply an invalid token to retrieve plaintext attachments without a session or channel membership.

Affected products (as reported)

Vendor	Product	Versions
aozorae	EdgeChat	0 – before 2.20.3

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/aozorae/Edgechat/issues/58 issue-tracking
https://github.com/aozorae/Edgechat/commit/38cb5cf42d8014ca64624d4f4d565419b2fbeda9 patch
https://github.com/aozorae/Edgechat/blob/1288c66997d5e2f9eefc515cf60b2072f8d655be/worker/src/data/uploaded-files.js#L146 technical-description
https://hackmd.io/@hieund/edgechat-files-unauthenticated-public-attachment-disclosure technical-description
VulnCheck Advisory: EdgeChat before 2.20.3 Missing Authentication for Attachment Download via GET /files/:key third-party-advisory