XSS in Inovector Mixpost
CVE-2026-57958
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Inovector Mixpost — versions 0
Weakness classification (CWE)
References
- github.com/inovector/mixpost/issues/204 (issue-tracking)
- www.vulncheck.com/advisories/mixpost-reflected-xss-via-oauth-callback-error-par… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-57958?
- CVE-2026-57958 is a medium-severity vulnerability in Inovector Mixpost, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-29.
- How severe is CVE-2026-57958?
- Medium severity. CVSS v3 base score is 6.1 out of 10.