CVE-2026-9519 stonith404 pingvin-share Sign-in Auto-Redirect signIn.tsx getServerSideProps cross site scripting
Remote attackers can execute arbitrary scripts via the redirect parameter in the sign-in page, potentially compromising user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-9519?
CVE-2026-9519 is a medium-severity cross-site scripting vulnerability in stonith404 pingvin-share, published on 26 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-9519?
How do I fix CVE-2026-9519?
No fix has been published for CVE-2026-9519 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-9519 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9519 exists.
Sources
Also known as GHSA-3c7f-qfqh-4hvx.