CVE-2026-78187 Piwigo Public Authentication cross site scripting
Remote attackers can inject malicious scripts via the lang parameter in Piwigo's public authentication page, potentially compromising user sessions.
- 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-2026-78187?
CVE-2026-78187 is a low-severity cross-site scripting vulnerability in Piwigo, published on 24 Aug 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 vulnerability has been found in Piwigo 16.3.0. This impacts an unknown function of the component Public Authentication Page. Such manipulation of the argument lang leads to cross site scripting. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is said to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 16.4.0 will fix this issue. The name of the patch is 5277a7dee4b8f1a174f1d69e1e2a4e1c82a3fc9e. It is recommended to upgrade the affected component.
Which versions are affected by CVE-2026-78187?
How do I fix CVE-2026-78187?
No fix has been published for CVE-2026-78187 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-2026-78187 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78187 exists.
Sources
Also known as GHSA-p4vh-hfqq-9prq, GHSA-rr39-mf4j-6594.