CVE-2023-23956
Published: 30 May 2023
Summary
CVE-2023-23956 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Broadcom Symantec Siteminder Webagent. Its CVSS base score is 5.4 (Medium).
Operationally, ranked in the top 8.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2023-23956 is a stored cross-site scripting vulnerability (CWE-79) affecting Symantec SiteMinder WebAgent version 12.52. The flaw permits an attacker to supply malicious HTML and JavaScript that executes in the victim's browser, yielding a CVSS 3.1 score of 5.4 under the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
An authenticated user with low privileges can inject the payload over the network; successful exploitation requires the victim to interact with the crafted content and results in limited confidentiality and integrity impacts within a changed security context, allowing actions such as session hijacking or unauthorized actions on behalf of the targeted user.
Broadcom security advisories referenced in the disclosure provide official guidance on available patches and configuration changes to address the issue in supported SiteMinder deployments. Public proof-of-concept material has also been posted to Packet Storm.
The associated EPSS score has remained in a narrow band between 0.0711 and a peak of 0.0818, indicating modest but stable exploitation interest rather than a pronounced post-disclosure increase.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-28021
Vulnerability details
A user can supply malicious HTML and JavaScript code that will be executed in the client browser
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.