CVE-2026-82451: Formwork < 2.3.11 Stored XSS via Referer Header

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-29 · updated 2026-09-23
Weakness: CWE-79

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.

Affected products

getformwork formwork: from 2.0.0 through 2.3.10

References

https://github.com/getformwork/formwork/releases/tag/2.3.11
https://github.com/getformwork/formwork/security/advisories/GHSA-hpgc-57cm-66pc
https://www.vulncheck.com/advisories/formwork-stored-xss-via-referer-header

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