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CVE-2023-3526

26
FAUCET Score

CVE-2023-3526 is a critical reflective Cross-Site Scripting (XSS) vulnerability affecting PHOENIX CONTACT TC ROUTER and TC CLOUD CLIENT devices, specifically versions prior to 2.07.2 and 2.06.10 respectively. An unauthenticated remote attacker can exploit this flaw within the license viewer page to execute arbitrary code in the context of a user's browser. With a CVSS score of 9.6, this vulnerability is highly severe due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.06.10CPE matchmatch criteria
cpe:2.3:o:phoenixcontact:cloud_client_1101t-tx_firmware:*:*:*:*:*:*:*:*
< 2.07.2CPE matchmatch criteria
cpe:2.3:o:phoenixcontact:tc_cloud_client_1002-4g_att_firmware:*:*:*:*:*:*:*:*
< 2.07.2CPE matchmatch criteria
cpe:2.3:o:phoenixcontact:tc_cloud_client_1002-4g_firmware:*:*:*:*:*:*:*:*
< 2.07.2CPE matchmatch criteria
cpe:2.3:o:phoenixcontact:tc_cloud_client_1002-4g_vzw_firmware:*:*:*:*:*:*:*:*
< 2.07.2CPE matchmatch criteria
cpe:2.3:o:phoenixcontact:tc_router_3002t-4g_att_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.6CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.58%
Probability of exploitation in next 30 days
EPSS Percentile
73.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0158 is in the 79th percentile among its peer group of 836 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/174152/Phoenix-Contact-TC-Cloud-TC-Router-2.x-XSS-Memory-Consumption.html
cert.vde.com / en/advisories/VDE-2023-017
Third Party Advisory
seclists.org / fulldisclosure/2023/Aug/12