What is CVE-2026-9519?

CVE-2026-9519 is a medium-severity vulnerability in Stonith404 Pingvin-Share, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-05-26.

How severe is CVE-2026-9519?

Medium severity. CVSS v3 base score is 4.3 out of 10.

RCE in Stonith404 Pingvin-Share

CVE-2026-9519

A security flaw has been discovered in stonith404 pingvin-share up to 1.13.0. This affects the function getServerSideProps of the file frontend/src/pages/auth/signIn.tsx of the component Sign-in Auto-Redirect. The manipulation of the argument redirect results in cross site scripting. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-05-26 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.7% 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: 0.004 · change: +0.001

Affected products

Stonith404 Pingvin-Share — versions 1.0, 1.1, 1.2

Weakness classification (CWE)

References

vuldb.com/vuln/365539 (technical-description, vdb-entry)
vuldb.com/vuln/365539/cti (signature, permissions-required)
vuldb.com/submit/814364 (third-party-advisory)
gist.github.com/TrebledJ/0efceef4f3a2e0515cc2fe96b4c22679 (exploit)

Frequently asked questions

What is CVE-2026-9519?: CVE-2026-9519 is a medium-severity vulnerability in Stonith404 Pingvin-Share, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-05-26.
How severe is CVE-2026-9519?: Medium severity. CVSS v3 base score is 4.3 out of 10.