CVE-2026-103540
CVE-2026-103540 is a medium-severity vulnerability with a CVSS 3.x base score of 6.3. 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-791.
Key facts
- Severity: Medium (CVSS 3.x base score 6.3)
- CVSS v2: 6.5
- CVSS v4: 2.1
- EPSS exploit prediction: 0% (13th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-791
- Published:
- Last modified:
Description
A security vulnerability has been detected in formtools.org Form Tools up to 3.1.1. This vulnerability affects the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles leads to improper neutralization of special elements used in a template engine. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Frequently asked questions
- What is CVE-2026-103540?
- A security vulnerability has been detected in formtools.org Form Tools up to 3.1.1. This vulnerability affects the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles leads to improper neutralization of special elements used in a template engine. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
- How severe is CVE-2026-103540?
- CVE-2026-103540 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2026-103540 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-103540?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-103540 published?
- CVE-2026-103540 was published on 2026-10-01.
References
- https://github.com/formtools/core/issues/956
- https://github.com/wawyw/cve_report/blob/main/formtools_1.md
- https://vuldb.com/cve/CVE-2026-103540
- https://vuldb.com/submit/957845
- https://vuldb.com/vuln/412350
- https://vuldb.com/vuln/412350/cti
Other CWE-791 vulnerabilities
- CVE-2025-0324 — Critical (CVSS 9.4): The VAPIX Device Configuration framework allowed a privilege escalation, enabling a lower-privileged user to…
- CVE-2024-47590 — High (CVSS 8.8): An unauthenticated attacker can create a malicious link which they can make publicly available. When an authenticated…
- CVE-2026-44232 — High (CVSS 8.7): DSSRF is a Node.js library that provides a wide range of utilities and advanced SSRF defense checks. Prior to 1.0.3,…
- CVE-2022-2132 — High (CVSS 8.6): A permissive list of allowed inputs flaw was found in DPDK. This issue allows a remote attacker to cause a denial of…
- CVE-2024-45481 — High (CVSS 8.5): An Incomplete Filtering of Special Elements vulnerability in scripts using the SSH server on B&R APROL <4.4-00P5 may…
- CVE-2026-11998 — High (CVSS 7.6): A flaw in AngularJS' Strict Contextual Escaping (SCE) logic allows bypassing certain SCE policies for resource URLs and…