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Bug bounty reports15,219

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

Program:Nextcloud
Status:Valid
Clear
Severity
Weakness
Year
Bounty paid132
Access stated
Access needed
  • No account0
  • A user account2
  • A privileged role0
  • Admin0
  • Physical or local access0
  • Not clear from the report0
Technique
Clear filters517 of 15,219 reports
Disclosed bug bounty reports
ReportStatusWeaknessSeverityDisclosedBountyVotes
[Nextcloud 9.0.53] Content Spoofing in 'trustDomain' parameter#153251ValidMisconfiguration and Insecure Design–2016-12-05–1
demo.nextcloud.com: Content spoofing due to default Apache Error Page#156425ValidMisconfiguration and Insecure Design–2016-08-30–1
Content Injection - demo.nextcloud.com#161323ValidMisconfiguration and Insecure Design–2016-08-26–1
Slow Http attack on nextcloud(DOS)#163823ValidDenial of Service–2016-10-05–1
xss on demo.nextcloud.com due to outdated version#177713ValidCross-site Scripting–2016-11-26–1
WebDAV Empty Property search leads to full CPU usage#255822ValidDenial of Service–2020-03-01–1
Broken link for wrong domain entry may be leveraged for Phishing, Misinformation, Serving Malware#279717ValidNo weakness recorded–2020-03-01–1
xss on setup config page#812028ValidCross-site Scripting–2021-02-14–1
Nextcloud server software: Content Spoofing#145463ValidMisconfiguration and Insecure Design–2016-07-19–2
Content Injection 404 page#145849ValidMisconfiguration and Insecure Design–2016-06-19–2
Content Injection in subdomain#145854ValidMisconfiguration and Insecure Design–2016-06-19–2
Content spoofing in cloud.nextcloud.com#152925ValidMisconfiguration and Insecure Design–2016-08-30–2
Arbitrary File Upload in Logo & Log in image Theming setting.#155690ValidCross-site Scripting–2016-10-05–2
Content Injection - apps.nextcloud.com#161299ValidMisconfiguration and Insecure Design–2016-08-26–2
Share tokens for public calendars disclosed (NC-SA-2017-011)#218876ValidInformation Disclosure–2017-06-06–2
Stored XSS in Gallery application (NC-SA-2017-010)#222838ValidCross-site Scripting–2017-06-06–2
Nextcloud logs ldap passwords#264426ValidAuthentication–2020-01-31–2
Missing memory corruption protection on Windows release built#380102ValidMemory Corruption–2020-08-14–2
Content spoofing on https://surveyserver.nextcloud.com#473144ValidInjection and Smuggling–2021-02-14–2
External Storage - WebDAV - New user has access to storage from deleted user (same user-ID)#549831ValidInformation Disclosure–2021-02-14–2
Improper integrity protection of server-side encryption keys#732431ValidAuthentication–2020-11-13–2
The password of a mail share is not hashed if the password is given when the share is created#885041ValidAuthentication–2020-10-28–2
DoS attack against the client when entering a long password#949712ValidDenial of Service–2021-02-14–2
No password confirmation required when using apptoken on sensitive endpoint#3566607ValidAccess ControlMedium2026-10-27–2
Content Spoofing#145374ValidMisconfiguration and Insecure Design–2016-06-19–3
https://newsletter.nextcloud.com Directory listening and Information Disclosure#145603ValidInformation Disclosure–2016-06-18–3
No captcha on newsletter.nextcloudcom leaves vulnerable to email spammers#145612ValidMisconfiguration and Insecure Design–2016-06-19–3
Content Spoofing/Text Injection - docs.nextcloud.org#145850ValidMisconfiguration and Insecure Design–2016-06-19–3
Content injection in subdomain#145853ValidMisconfiguration and Insecure Design–2016-06-19–3
xss for admin of https://newsletter.nextcloud.com#153799ValidCross-site Scripting–2017-02-17–3
demo.nextcloud.com: Content spoofing due to default Apache Error Page#155189ValidMisconfiguration and Insecure Design–2016-09-29–3
Reflected Self-XSS Vulnerability in the Comment section of Files Information#164027ValidCross-site Scripting–2016-08-30$1003
**minor issue ** -Nextcloud 10.0 session issue with desktop client and android client#165353ValidMisconfiguration and Insecure Design–2020-03-01–3
ci.nextcloud.com: CVE-2015-5477 BIND9 TKEY Vulnerability + Exploit (Denial of Service)#237860ValidDenial of Service–2017-06-08–3
Bruteforce in admin panel#341074ValidAuthentication–2020-01-31–3
Missing X-Content-Type-Options#369979ValidMisconfiguration and Insecure Design–2020-03-01–3
Github repo's wiki publicly editable#475114ValidAccess Control–2020-01-31–3
Password authentication at newsletter.nextcloud.com discloses username list#476439ValidInformation Disclosure–2020-03-01–3
W3 Total Cache plugin multiple vulnerabilities#561805ValidNo weakness recorded–2019-07-28–3
Persistent XSS on favorite via filename#685491ValidCross-site Scripting–2019-12-12–3
Improper confidentiality protection of server-side encryption keys#743505ValidAuthentication–2020-11-13–3
Bypassing Passcode/Device credentials#747726ValidAccess Control–2021-01-15–3
External storage app saves password for all users in the database#867164ValidAuthentication–2021-03-01–3
New users can read all Nextcloud Deck data from previous user with same username#882258ValidInsecure Direct Object Reference–2021-02-14–3
Contacts menu (not app) fails to restrict (to local groups) for contacts from federated servers#895730ValidInformation Disclosure–2020-07-25–3
Ransomware protection is missing extentions#1195568ValidNo weakness recorded–2021-06-16–3
Contacts only sanitizes PHOTO svg if mime type is all lower case#1789602ValidCross-site Scripting–2023-06-24–3
Unauthenticated Persistent Denial-of-Service via Federated Share Injection#3679640ValidDenial of ServiceHigh2026-10-27–3
stats.nextcloud.com: Content Injection#145375ValidMisconfiguration and Insecure Design–2016-07-17–4
Enumeration of subscribed users and unauthenticated email unsubscriptions on https://newsletter.nextcloud.com/?p=unsubscribe#145396ValidInformation Disclosure–2016-06-19–4

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 (348 analysed so far), which can be wrong. Data as of 2026-11-14.

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