CVE-2015-8766 — Multiple cross-site scripting (XSS) vulnerabilities in content/content.systempreferences.php in Symphony CMS before 2.6.4 allow remote attackers to inject arbitrary web script or HTML via the (1) email_sendmail[from_name], (2) email_sendmail[from_address], (3) email_smtp[from_name], (4) email_smtp[from_address], (5) email_smtp[host], (6) email_smtp[port], (7) jit_image_manipulation[trusted_external_sites], or (8) maintenance_mode[ip_whitelist] parameters to system/preferences

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MEDIUM

Multiple cross-site scripting (XSS) vulnerabilities in content/content.systempreferences.php in Symphony CMS before 2.6.4 allow remote attackers to inject arbitrary web script or HTML via the (1) email_sendmail[from_name], (2) email_sendmail[from_address], (3) email_smtp[from_name], (4) email_smtp[from_address], (5) email_smtp[host], (6) email_smtp[port], (7) jit_image_manipulation[trusted_external_sites], or (8) maintenance_mode[ip_whitelist] parameters to system/preferences

Published Jan 8, 2016

6.1

MEDIUM

CVSS 3.0

EPSS 1.77%

Description

Multiple cross-site scripting (XSS) vulnerabilities in content/content.systempreferences.php in Symphony CMS before 2.6.4 allow remote attackers to inject arbitrary web script or HTML via the (1) email_sendmail[from_name], (2) email_sendmail[from_address], (3) email_smtp[from_name], (4) email_smtp[from_address], (5) email_smtp[host], (6) email_smtp[port], (7) jit_image_manipulation[trusted_external_sites], or (8) maintenance_mode[ip_whitelist] parameters to system/preferences.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.77% 0.01767

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01767

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.77% (0.01767)	77.27th	v5 (v2026.06.15)
Jun 15, 2026	1.77% (0.01767)	75.12th	v5 (v2026.06.15)
Mar 17, 2025	0.24% (0.00235)	44.32th	v4 (v2025.03.14)
Dec 12, 2024	0.24% (0.00235)	62.47th	v3 (v2023.03.01)
Jun 14, 2024	0.24% (0.00235)	61.75th	v3 (v2023.03.01)
Mar 7, 2023	0.24% (0.00235)	59.75th	v3 (v2023.03.01)
Mar 6, 2023	1.21% (0.01213)	66.61th	v2 (v2022.01.01)
Feb 17, 2023	1.21% (0.01213)	66.22th	v2 (v2022.01.01)
Apr 1, 2022	1.21% (0.01213)	64.21th	v2 (v2022.01.01)
Feb 4, 2022	1.21% (0.01213)	40.54th	v2 (v2022.01.01)

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (7)

http://seclists.org/fulldisclosure/2015/Dec/60
mailing-listx_refsource_FULLDISCExploit
http://www.getsymphony.com/download/releases/version/2.6.4/
x_refsource_CONFIRMPatchVendor Advisory
https://cybersecurityworks.com/zerodays/cve-2015-8766-getsymphoney.html
x_refsource_MISC
https://github.com/advisories/GHSA-4c5w-qqfg-grf3
Advisory
https://github.com/symphonycms/symphony-2/commit/651e150091c61fb60ad1dff2bc2166185a83d9d6
x_refsource_CONFIRM
https://nvd.nist.gov/vuln/detail/CVE-2015-8766
https://web.archive.org/web/20210321090853/https://cybersecurityworks.com/zerodays/cve-2015-8766-getsymphoney.html

Link	Providers	Tags
http://seclists.org/fulldisclosure/2015/Dec/60		mailing-listx_refsource_FULLDISCExploit
http://www.getsymphony.com/download/releases/version/2.6.4/		x_refsource_CONFIRMPatchVendor Advisory
https://cybersecurityworks.com/zerodays/cve-2015-8766-getsymphoney.html		x_refsource_MISC
https://github.com/advisories/GHSA-4c5w-qqfg-grf3		Advisory
https://github.com/symphonycms/symphony-2/commit/651e150091c61fb60ad1dff2bc2166185a83d9d6		x_refsource_CONFIRM
https://nvd.nist.gov/vuln/detail/CVE-2015-8766
https://web.archive.org/web/20210321090853/https://cybersecurityworks.com/zerodays/cve-2015-8766-getsymphoney.html