CVE-2026-82451 Formwork < 2.3.11 Stored XSS via Referer Header
Unauthenticated attackers can inject malicious scripts via the Referer header, leading to code execution in administrator browsers.
- 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-2026-82451?
CVE-2026-82451 is a medium-severity cross-site scripting vulnerability in getformwork Formwork, published on 29 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
Formwork before 2.3.11 contains a stored cross-site scripting vulnerability in visit tracking that records the Referer header host unescaped. Unauthenticated attackers can craft malicious Referer headers to inject markup that executes in administrator browsers when viewing the Statistics panel.
Weakness: CWE-79
Which versions are affected by CVE-2026-82451?
How do I fix CVE-2026-82451?
No fix has been published for CVE-2026-82451 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-2026-82451 being exploited?
There is no known exploitation of CVE-2026-82451 in the wild and no public exploit code.
Sources
Also known as GHSA-3p45-hx6j-c7f5, GHSA-hpgc-57cm-66pc.