Vulnerability · Published Jun 29, 2026 · Assigned by VulnCheck

CVE-2026-57958Mixpost 2.6.0 - Reflected XSS via OAuth Callback Error Parameter

Medium 6.1

In plain English

A medium-severity cross-site scripting in mixpost from inovector. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 88.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Mixpost through 2.6.0 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in authenticated users' browsers by crafting malicious OAuth callback URLs with unsanitized error query parameters. Attackers can exploit the OAuth callback controller's failure to sanitize error parameters before rendering them through Laravel flash messages via the Vue v-html directive to hijack authenticated user sessions or perform unauthorized actions.

Affected products (as reported)

Vendor	Product	Versions
inovector	mixpost	0 – through 2.6.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Researcher Disclosure issue-tracking
https://www.vulncheck.com/advisories/mixpost-reflected-xss-via-oauth-callback-error-parameter third-party-advisory