CVE-2026-45307 Speakr: Open redirect in is_safe_url via parser mismatch on next parameter
An open redirect in Speakr allows attackers to redirect users to malicious sites via a parser mismatch in the next parameter.
- 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-2026-45307?
CVE-2026-45307 is a medium-severity vulnerability in murtaza-nasir speakr, published on 28 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
Speakr is a personal, self-hosted web application designed for transcribing audio recordings. Prior to 0.8.20-alpha, the is_safe_url() helper used to validate post-login redirect targets applied urljoin(request.host_url, target) before parsing, while the controller passed the raw target to redirect(). A scheme-relative input such as ////evil.com resolved to a same-host URL during validation but was emitted verbatim in the Location header, where the browser interpreted it as a network-path-relative redirect to an attacker-controlled host. This vulnerability is fixed in 0.8.20-alpha.
Weakness: CWE-601
Which versions are affected by CVE-2026-45307?
How do I fix CVE-2026-45307?
No fix has been published for CVE-2026-45307 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-45307 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45307 exists.
Sources
Also known as GHSA-5cpp-mqgh-4c38.