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CVE-2024-21728MediumCVSS 6.1CVE published 15 February 2024Added to mySites.guru 15 February 2024

osTicky2 (com_osticky2) 2.2.8 and below - Unauthenticated Open Redirect via base64 return Parameter

osTicky2 (osTicket Bridge) by SmartCalc bridges a Joomla front end to an osTicket support system. Versions up to and including 2.2.8 let an attacker control the base64-encoded "return" parameter used to build the login redirect, so a crafted link on the site sends the visitor to an attacker-controlled destination after login. That is a credible phishing primitive because the malicious link starts on the trusted domain. CVSS 6.1 (Medium), no authentication required, but the victim must follow the link. The Joomla CNA records 2.2.8 as still affected and the extension has had no release since 2016, so there is no version to update to. osTicky2 is Joomla 3 only, which is itself end of life. Remove the extension. Note: the NVD description and CPE data instead read as "fixed in 2.2.8"; the CNA affected-products block (the vendor-supplied field, and the one this rule follows) says 2.2.8 is affected. Revisit if the vendor ever clarifies.

Is my site affected?

Affected
osTicky2 up to and including 2.2.8
Fixed in
A release after 2.2.8
What to do
Update osTicky2 to the newest release from the vendor. This flaw covers versions up to 2.2.8, so any later release is outside it.
Check whether your sites are affected

How CVE-2024-21728 is scored

The base metrics as CISA-ADP published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.

6.1 Medium

CVSS 3.1, scored by CISA-ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

How it is reached

AV:N Attack vector
Network. Reachable across the internet
AC:L Attack complexity
Low. Nothing to work around, it just works
PR:N Privileges required
None. No account needed
UI:R User interaction
Required. Someone has to click or visit something
S:C Scope
Changed. The flaw reaches past the extension it is in

What it does

C:L Confidentiality
Low. Some data can be read
I:L Integrity
Low. Some data can be altered
A:N Availability
None. The site stays up

Timeline

  1. 15 February 2024CVE-2024-21728 record published by its CNA
  2. 15 February 2024mySites.guru check added for osTicky2 (up to and including 2.2.8)

Rule details

References

CVE-2024-21728 questions

Which versions are affected by CVE-2024-21728?
CVE-2024-21728 affects osTicky2 up to and including 2.2.8.
How do I fix CVE-2024-21728?
Update osTicky2 to the newest release from the vendor. This flaw covers versions up to 2.2.8, so any later release is outside it.
How severe is CVE-2024-21728?
CISA-ADP scores it 6.1 (Medium) under CVSS 3.1. In plain terms: reachable across the internet, no account needed and someone has to click or visit something.

Running an affected version on a site you manage?

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This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.

Rules current as of 5 October 2026.