How severe is CVE-2023-3526?

CVE-2023-3526 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-3526 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3526?

CVE-2023-3526 primarily affects Phoenixcontact Cloud Client 1101t-tx Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-3526?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-3526 published?

CVE-2023-3526 was published on 2023-08-08 and last updated on 2026-06-17.

CVE-2023-3526

CVE-2023-3526 is a critical-severity vulnerability in Phoenixcontact Cloud Client 1101t-tx Firmware with a CVSS 3.x base score of 9.6. 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: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Phoenixcontact Cloud Client 1101t-tx Firmware
Published: 2023-08-08
Last modified: 2026-06-17

Description

In PHOENIX CONTACTs TC ROUTER and TC CLOUD CLIENT in versions prior to 2.07.2 as well as CLOUD CLIENT 1101T-TX/TX prior to 2.06.10 an unauthenticated remote attacker could use a reflective XSS within the license viewer page of the devices in order to execute code in the context of the user's browser.

Frequently asked questions

What is CVE-2023-3526?: In PHOENIX CONTACTs TC ROUTER and TC CLOUD CLIENT in versions prior to 2.07.2 as well as CLOUD CLIENT 1101T-TX/TX prior to 2.06.10 an unauthenticated remote attacker could use a reflective XSS within the license viewer page of the devices in order to execute code in the context of the user's browser.
How severe is CVE-2023-3526?: CVE-2023-3526 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-3526 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3526?: CVE-2023-3526 primarily affects Phoenixcontact Cloud Client 1101t-tx Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-3526?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-3526 published?: CVE-2023-3526 was published on 2023-08-08 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:o:phoenixcontact:cloud_client_1101t-tx_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:tc_cloud_client_1002-4g_att_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:tc_cloud_client_1002-4g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:tc_cloud_client_1002-4g_vzw_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:tc_router_3002t-4g_att_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:tc_router_3002t-4g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:phoenixcontact:tc_router_3002t-4g_vzw_firmware:*:*:*:*:*:*:*:*

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