CVE-2026-15743 Catalyst::Plugin::Static::Simple versions through 0.38 for Perl mark responses as publicly cacheable
Attackers can access sensitive user data via shared caches because the plugin incorrectly marks authenticated responses as publicly cacheable.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-15743?
CVE-2026-15743 is a medium-severity vulnerability, published on 20 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Catalyst::Plugin::Static::Simple versions through 0.38 for Perl mark responses as publicly cacheable.
The _serve_static method always sets the Cache-Control header to "public", with no means of overriding it. This advises proxies that the content may be stored in a shared cache, and may be reused in responses to requests from other users. (This includes requests with an Authorization header.)
Configuring the expires time to "0" to disable caching, as documented, is ignored.
Weakness: CWE-524
Which versions are affected by CVE-2026-15743?
How do I fix CVE-2026-15743?
Apply the vendor's patch.
Is CVE-2026-15743 being exploited?
There is no known exploitation of CVE-2026-15743 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-15743, GHSA-cj6v-gcgr-8wgg, MGASA-2026-0393, UBUNTU-CVE-2026-15743.