What is CVE-2017-12778?

The UI Lock feature in qBittorrent version 3.3.15 is vulnerable to Authentication Bypass, which allows Attack to gain unauthorized access to qBittorrent functions by tampering the affected flag value of the config file at the C:\Users\ \Roaming\qBittorrent pathname. The attacker must change the value of the "locked" attribute to "false" within the "Locking" stanza. NOTE: This is an intended behavior. See https://github.com/qbittorrent/qBittorrent/wiki/I-forgot-my-UI-lock-password

How severe is CVE-2017-12778?

CVE-2017-12778 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2017-12778 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12778?

CVE-2017-12778 affects Qbittorrent. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-12778?

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

When was CVE-2017-12778 published?

CVE-2017-12778 was published on 2019-05-09 and last updated on 2026-06-17.

CVE-2017-12778

CVE-2017-12778 is a high-severity vulnerability in Qbittorrent with a CVSS 3.x base score of 7.1. 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-287.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 3.6
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Qbittorrent
Published: 2019-05-09
Last modified: 2026-06-17

Description

The UI Lock feature in qBittorrent version 3.3.15 is vulnerable to Authentication Bypass, which allows Attack to gain unauthorized access to qBittorrent functions by tampering the affected flag value of the config file at the C:\Users\<username>\Roaming\qBittorrent pathname. The attacker must change the value of the "locked" attribute to "false" within the "Locking" stanza. NOTE: This is an intended behavior. See https://github.com/qbittorrent/qBittorrent/wiki/I-forgot-my-UI-lock-password

Frequently asked questions

What is CVE-2017-12778?: The UI Lock feature in qBittorrent version 3.3.15 is vulnerable to Authentication Bypass, which allows Attack to gain unauthorized access to qBittorrent functions by tampering the affected flag value of the config file at the C:\Users\<username>\Roaming\qBittorrent pathname. The attacker must change the value of the "locked" attribute to "false" within the "Locking" stanza. NOTE: This is an intended behavior. See https://github.com/qbittorrent/qBittorrent/wiki/I-forgot-my-UI-lock-password
How severe is CVE-2017-12778?: CVE-2017-12778 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2017-12778 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12778?: CVE-2017-12778 affects Qbittorrent. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-12778?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-12778 published?: CVE-2017-12778 was published on 2019-05-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:qbittorrent:qbittorrent:3.3.15:*:*:*:*:*:*:*

More vulnerabilities in Qbittorrent

CVE-2023-30801 — Critical (CVSS 9.8): All versions of the qBittorrent client through 4.5.5 use default credentials when the web user interface is enabled.…
CVE-2019-13640 — Critical (CVSS 9.8): In qBittorrent before 4.1.7, the function Application::runExternalProgram() located in app/application.cpp allows…
CVE-2024-51774 — High (CVSS 8.1): qBittorrent before 5.0.1 proceeds with use of https URLs even after certificate validation errors.
CVE-2017-6504 — Medium (CVSS 6.1): WebUI in qBittorrent before 3.3.11 did not set the X-Frame-Options header, which could potentially lead to clickjacking.
CVE-2017-6503 — Medium (CVSS 6.1): WebUI in qBittorrent before 3.3.11 did not escape many values, which could potentially lead to XSS.
CVE-2025-54310 — Medium (CVSS 4.0): qBittorrent before 5.1.2 does not prevent access to a local file that is referenced in a link URL. This affects…

All CVEs affecting Qbittorrent →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →