How severe is CVE-2016-10256?

CVE-2016-10256 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2016-10256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-10256?

CVE-2016-10256 primarily affects Broadcom Symantec Proxysg. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-10256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-10256 published?

CVE-2016-10256 was published on 2018-01-10 and last updated on 2026-06-17.

CVE-2016-10256

CVE-2016-10256 is a medium-severity vulnerability in Broadcom Symantec Proxysg with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Broadcom Symantec Proxysg
Published: 2018-01-10
Last modified: 2026-06-17

Description

The Symantec ProxySG 6.5 (prior to 6.5.10.6), 6.6, and 6.7 (prior to 6.7.2.1) management console is susceptible to a reflected XSS vulnerability. A remote attacker can use a crafted management console URL in a phishing attack to inject arbitrary JavaScript code into the management console web client application. This is a separate vulnerability from CVE-2016-10257.

Frequently asked questions

What is CVE-2016-10256?: The Symantec ProxySG 6.5 (prior to 6.5.10.6), 6.6, and 6.7 (prior to 6.7.2.1) management console is susceptible to a reflected XSS vulnerability. A remote attacker can use a crafted management console URL in a phishing attack to inject arbitrary JavaScript code into the management console web client application. This is a separate vulnerability from CVE-2016-10257.
How severe is CVE-2016-10256?: CVE-2016-10256 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2016-10256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-10256?: CVE-2016-10256 primarily affects Broadcom Symantec Proxysg. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-10256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-10256 published?: CVE-2016-10256 was published on 2018-01-10 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:broadcom:symantec_proxysg:*:*:*:*:*:*:*:*
cpe:2.3:a:broadcom:symantec_proxysg:6.6:*:*:*:*:*:*:*

More vulnerabilities in Broadcom Symantec Proxysg

CVE-2021-30648 — Critical (CVSS 9.8): The Symantec Advanced Secure Gateway (ASG) and ProxySG web management consoles are susceptible to an authentication…
CVE-2018-5241 — Critical (CVSS 9.8): Symantec Advanced Secure Gateway (ASG) 6.6 and 6.7, and ProxySG 6.5, 6.6, and 6.7 are susceptible to a SAML…
CVE-2016-9100 — High (CVSS 7.8): Symantec Advanced Secure Gateway (ASG) 6.6 prior to 6.6.5.13, ASG 6.7 prior to 6.7.3.1, ProxySG 6.5 prior to 6.5.10.6,…
CVE-2017-13677 — High (CVSS 7.5): Denial-of-service (DoS) vulnerability in the Symantec Advanced Secure Gateway (ASG) and ProxySG management consoles. A…
CVE-2016-9097 — High (CVSS 7.2): The Symantec Advanced Secure Gateway (ASG) 6.6 prior to 6.6.5.8, ProxySG 6.5 prior 6.5.10.6, ProxySG 6.6 prior to…
CVE-2016-10258 — Medium (CVSS 6.8): Unrestricted file upload vulnerability in the Symantec Advanced Secure Gateway (ASG) and ProxySG management consoles. A…

All CVEs affecting Broadcom Symantec Proxysg →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2026-106102 — Critical (CVSS 10.0): Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the SSR-only…
CVE-2026-59167 — Critical (CVSS 10.0): SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 2.47.11,…
CVE-2026-85061 — Critical (CVSS 10.0): MapLibre GL JS is an interactive vector tile map library for web browsers. Prior to 6.4.1, DOM.sanitize() in…
CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →