Vulnerability · Published Mar 23, 2026 · Assigned by GitHub_M

CVE-2026-23480Blinko: Low Privilege User Privilege Escalation - upsertUser Endpoint

Medium 5.3

In plain English

A medium-severity authentication bypass in blinko from blinkospace. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.4%top 70.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Blinko is an AI-powered card note-taking project. Prior to version 1.8.4, there is a privilege escalation vulnerability. The upsertUser endpoint has 3 issues: it is missing superAdminAuthMiddleware, any logged-in user can call it; the originalPassword is an optional parameter and if not provided password verification is skipped; there is no check for input.id === ctx.id (ownership verification). This could result in any authenticated user modifying other users' passwords, direct escalation to superadmin, and complete account takeover. This issue has been patched in version 1.8.4.

Affected products (as reported)

Vendor	Product	Versions
blinkospace	blinko	< 1.8.4

Weakness: CWE-288 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/blinkospace/blinko/security/advisories/GHSA-r3mv-q7ww-86p6 x_refsource_CONFIRM
https://github.com/blinkospace/blinko/commit/3afbdf486b6f371bdac5781dea6289749f2c4c03 x_refsource_MISC
https://github.com/blinkospace/blinko/releases/tag/1.8.4 x_refsource_MISC