CVE-2026-2709: busy Callback app.js redirect

Severity: low (CVSS 3.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-19 · updated 2026-06-17
Weakness: CWE-601

Description

A flaw has been found in busy up to 2.5.5. The affected element is an unknown function of the file source-code/busy-master/src/server/app.js of the component Callback Handler. Executing a manipulation of the argument state can lead to open redirect. It is possible to launch the attack remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Affected products

busy: 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5

References

https://github.com/busyorg/busy/issues/2287
https://github.com/busyorg/busy/issues/2287#issue-3905518966
https://vuldb.com/?ctiid.346661
https://vuldb.com/?id.346661
https://vuldb.com/?submit.753299

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