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Bug bounty reports15,219

Publicly disclosed HackerOne reports, with the platform's own outcome and severity.

Program:Nextcloud
Status
Severity
Weakness
Year
Bounty paid132
Access stated
Access needed
Technique
Clear filters613 of 15,219 reports
Disclosed bug bounty reports
ReportStatusWeaknessSeverityDisclosedBountyVotes
Talk discloses turn server to anybody#1195593InformativeNo weakness recordedLow2021-05-26–5
Create alias does not validate account id#1129996ValidAccess ControlMedium2021-06-01–5
[nextcloud.com] Control character allowed in Submit Question#1081211ValidAccess ControlMedium2021-01-20–5
No set limit to try to login in "https://auth.nextcloud.com/auth/realms/master/protocol/openid-connect/auth" page.#855304InformativeAuthentication–2021-04-20–5
Anonymous file drop page ignores user profile visibility restrictions#752353ValidInformation Disclosure–2020-08-03–5
Downgrade encryption scheme and break integrity through known-plaintext attack#742588ValidCryptographyMedium2020-11-05–5
Bypass configured 2FA provider with another provider that can be set up at login#722748ValidAuthenticationMedium2020-03-01–5
potential RCE and XSS via file upload requiring user account and default settings#678727ValidCommand and Code InjectionHigh2020-04-01–5
Circle email-members have still access to a shared folder/file after they are removed from the circle#673724ValidAccess ControlLow2020-03-01$2005
Vulnerable W3 Total Cache plugin version in use on nextcloud.com#579116InformativeCross-Site Request ForgeryMedium2019-06-21–5
Missing DNSSEC#509390ValidCryptographyMedium2019-08-29–5
HTML injection with AutoComplete suggestions#383117ValidCross-site ScriptingNone2018-08-10–5
Banner Grabbing - Apache Server Version Disclousure#269449InformativeInformation Disclosure–2018-05-17–5
Unauthenticated 'display name' information leak on enumeration of login names#237232ValidInformation DisclosureMedium2020-03-01–5
Shared file link - password protection bypass under certain conditions#231917ValidInformation DisclosureMedium2018-09-25$505
RTLO character allowed in shared files#229170InformativeMisconfiguration and Insecure DesignMedium2020-08-17–5
Missing Rate Limiting protection leading to mass triggering of e-mails#224927ValidMisconfiguration and Insecure DesignMedium2017-06-05–5
Content spoofing due to the improper behavior of the 403 page#212770ValidMisconfiguration and Insecure Design–2017-05-18–5
Version 4.7.2 of wordpress is vulnerable#211206ValidNo weakness recordedHigh2017-03-07–5
LDAP login possible even though account doesn't match user filter#205908ValidAuthenticationNone2019-07-27–5
Missing SPF Flags on nextcloud.com#205250DuplicateMisconfiguration and Insecure Design–2017-02-10–5
Drone Nextcloud#198773InformativeNo weakness recorded–2017-02-12–5
HTTP-Basic Authentication on logs.nextcloud.com#198673InformativeMisconfiguration and Insecure Design–2017-01-17–5
Limitation of app specific password scope can be bypassed (NC-SA-2017-009)#191979ValidAccess ControlLow2017-05-08$3005
URI scheme bypass in mail app lead to HTML content spoof and opener control#175085ValidMisconfiguration and Insecure Design–2017-01-12–5
Dav sharing permissions issue#174896ValidAccess ControlMedium2017-05-20–5
Information Disclosure of .htaccess file in Private Server/Subdomain#163106ValidInformation Disclosure–2016-08-26–5
More content spoofing through dir param in the files app#154827ValidMisconfiguration and Insecure DesignLow2016-11-04$505
Email ID Disclosure.#146106InformativeInformation Disclosure–2016-06-20–5
Business/Functional logic bypass: Remove admins from admin group.#145745InformativeAccess Control–2016-06-19–5
Vulnerable Javascript library#145517InformativeInformation Disclosure–2016-06-17–5
nextcloud.com: Content Injection Custom 404 Error#145344ValidMisconfiguration and Insecure Design–2016-06-17–5
Possible RCE#145343InformativeCommand and Code Injection–2018-03-08–5
Files Confidential tagging can be bypassed with # in filename#3682163ValidAccess ControlMedium2026-10-27–4
user_oidc app is missing bruteforce protection#1954711ValidAuthenticationMedium2023-06-23–4
Reference fetch can saturate the server bandwidth for 10 seconds#1806223ValidDenial of ServiceMedium2023-04-29–4
Website PHP source code returned in javascript#1794462ValidNo weakness recordedMedium2023-04-10–4
Exception logging in Sharepoint app reveals clear-text connection details#1652903ValidCryptographyMedium2022-11-26–4
@nextcloud/logger NPM package brings vulnerable ansi-regex version#1607601ValidDenial of ServiceLow2022-07-29–4
Brute force protections don't work#1596918ValidInformation DisclosureLow2022-09-03–4
Ratelimits do not apply to OCS DataResponse#1214158ValidAuthenticationNone2021-08-11–4
No admin audit entry for enabling/disabling 2FA#1200989InformativeNo weakness recordedLow2021-06-16–4
DoS due to improper input validation can break the admin access into the user data will disallow him from editing that user's data.#1147611ValidDenial of ServiceHigh2021-06-01–4
PIN for passwordless WebAuthn is asked for but not verified#924393ValidAuthenticationMedium2020-10-28–4
Full path disclosure vulnerability via Upload .htaccess file#919429InformativeInformation Disclosure–2020-07-09–4
Social App does not validate server certificates for outgoing connections#915585ValidCryptographyMedium2020-11-17–4
SignUp using Fake Email#664200InformativeInput Validation and Logic–2019-08-02–4
Stored XSS on scan.nextcloud.com#390728ValidCross-site ScriptingLow2020-03-01–4
Disclosed Version of PORTS SSH|HTTP|SSL#358102DuplicateInformation DisclosureLow2018-06-14–4
Banner Grabbing - Apache Server Version Disclosure#348801InformativeInformation Disclosure–2018-05-17–4

Status and severity are HackerOne's. “Access stated” is what the title says; “Access needed” and techniques come from CyberSIXT's analysis of the public report (2,699 analysed so far), which can be wrong. Data as of 2026-11-15.