Vendor
misskey-dev
38 known vulnerabilities.
misskey-dev at a glance
- Last 12 months
- 15
- Critical · all time
- 5
- Exploited · all time
- 0
- Public exploit · all time
- 0
Show as table
| Month | Vulnerabilities | Critical |
|---|---|---|
| Nov 2026 | 0 | 0 |
| Oct 2026 | 3 | 0 |
| Sep 2026 | 0 | 0 |
| Aug 2026 | 5 | 1 |
| Jul 2026 | 2 | 0 |
| Jun 2026 | 0 | 0 |
| May 2026 | 0 | 0 |
| Apr 2026 | 0 | 0 |
| Mar 2026 | 3 | 1 |
| Feb 2026 | 0 | 0 |
| Jan 2026 | 0 | 0 |
| Dec 2025 | 2 | 0 |
| Nov 2025 | 0 | 0 |
| Oct 2025 | 0 | 0 |
| Sep 2025 | 0 | 0 |
| Aug 2025 | 0 | 0 |
| Jul 2025 | 0 | 0 |
| Jun 2025 | 0 | 0 |
| May 2025 | 3 | 0 |
| Apr 2025 | 0 | 0 |
| Mar 2025 | 1 | 1 |
| Feb 2025 | 2 | 0 |
| Jan 2025 | 0 | 0 |
| Dec 2024 | 6 | 0 |
Most common weaknesses
Products
38 results · Feed
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High 8.7
Misskey: Denial of service resulting from insufficient cleanup processing during file uploads
Misskey is an open source, federated social media platform. From 13.0.0 until 2025.4.1 and from 2025.5.0 until 2026.7.0, cleanup processing may not execute during file uploads. Repeated uploads can exhaust storage or file descriptors and deny service regardle…
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High 8.7
Misskey: Lack of rate limiting and size restrictions in RSS fetching API
Misskey is an open source, federated social media platform. From 12.112.1 until 2026.7.0, the unauthenticated fetch-rss API lacks rate limiting and response-size restrictions and performs synchronous XML parsing. An attacker can trigger unbounded outbound HTT…
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High 8.5
Misskey: Cross-site scripting in RSS feed item links
Misskey is an open source, federated social media platform. From 12.0.0 until 2026.7.0, the RSS components display feed item links from configured feeds without verifying their URL schemes. Missing URL scheme verification allows an attacker who controls feed …
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Medium 5.1
Misskey: Denial of Service via Uncontrolled Recursion in Theme Compilation
Misskey is an open source, federated social media platform. IVersions 8.63.0 and later, but prior to 2026.5.4, contain a vulnerability that can cause the Misskey web client to slow down or crash when it applies a malformed theme. This issue has been fixed in …
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High 8.9
Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared b…
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Critical 9.2
Misskey: JSON-LD signature validation + compaction may lead to improper activity handling
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issu…
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Low 2.3
Misskey: Lack of proper permission checks in Direct Messaging feature
Misskey is an open source, federated social media platform. Versions 2025.3.2 and later, but prior to 2026.5.4, contain a vulnerability where a lack of proper permission checks allows access to certain data points from the Direct Messages (formerly Chat) feat…
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Medium 6.3
Misskey: Improper Authorization in the Announcements API
Misskey is an open source, federated social media platform. All Misskey servers running versions 2024.5.0 and later, but prior to 2026.5.4, contain a vulnerability in the Server Announcements API where insufficient permission checks allow attackers to access …
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High 7.4
Misskey: TOTP tokens can be reused
Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password (TOTP) authentication in UserAuthService where insufficient validation of used tokens allows the reuse of a single-…
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Medium 6.9
Misskey: SSRF bypass in URL Preview
Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side Request Forgery (SSRF) vulnerability in URL preview functionality in UrlPreviewService. Due to missing network restrictions before establishing outbo…
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Low 2.3
Misskey lacks resource ownership validation
Misskey is an open source, federated social media platform. All Misskey servers running versions 10.93.0 and later, but prior to 2026.3.1, contain a vulnerability that allows importing other users' data due to lack of ownership validation. The impact of this …
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High 7.1
HTTP signature verification can be bypassed
Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardl…
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Critical 9.2
Misskey lacks proper authorization checks and input validation
Misskey is an open source, federated social media platform. All Misskey servers running versions 8.45.0 and later, but prior to 2026.3.1, contain a vulnerability that allows bad actors access to data that they ordinarily wouldn't be able to access due to insu…
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Medium 6.9
Misskey has a login rate limit bypass via spoofed X-Forwarded-For header
Misskey is an open source, federated social media platform. Attackers who use an untrusted reverse proxy or not using a reverse proxy at all can bypass IP rate limiting by adding a forged X-Forwarded-For header. Starting with version 2025.9.1, an option (`tru…
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High 7.1
misskey.js's export data contains private post data
Misskey is an open source, federated social media platform. Starting in version 13.0.0-beta.16 and prior to version 2025.12.0, an actor who does not have permission to view favorites or clips can can export the posts and view the contents. Version 2025.12.0 f…
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Medium 5.4
Misskey Directory Traversal Vulnerability in AiScript via `Mk:api`
Misskey is an open source, federated social media platform. Starting in version 12.31.0 and prior to version 2025.4.1, missing validation in `Mk:api` allows malicious AiScript code to access additional endpoints that it isn't designed to have access to. The m…
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High 7.2
Misskey CSS Style Injection Vulnerability In `MkUrlPreview`
Misskey is an open source, federated social media platform. Starting in version 12.0.0 and prior to version 2025.4.1, due to an oversight in the validation performed in `UrlPreviewService` and `MkUrlPreview`, it is possible for an attacker to inject arbitrary…
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Low 2.1
@misskey-dev/summaly Redirect Filter Bypass
@misskey-dev/summaly is a tool for getting a summary of a web page. Starting in version 3.0.1 and prior to version 5.2.1, a logic error in the main `summaly` function causes the `allowRedirects` option to never be passed to any plugins, and as a result, isn't…
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Critical 9.3
Misskey's Incomplete Patch of CVE-2024-52591 Leads to Forgery of Federated Notes
Misskey is an open source, federated social media platform. The patch for CVE-2024-52591 did not sufficiently validate the relation between the `id` and `url` fields of ActivityPub objects. An attacker can forge an object where they claim authority in the `ur…
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High 8.2
Misskey CSRF vulnerability due to insecure configuration of authentication cookie attributes
Misskey is an open source, federated social media platform. Starting in version 12.109.0 and prior to version 2025.2.0-alpha.0, due to a lack of CSRF protection and the lack of proper security attributes in the authentication cookies of Bull's dashboard, some…
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High 8.1
Misskey allows token to remain valid in cookie after signing out
Misskey is an open source, federated social media platform. Starting in version 12.109.0 and prior to version 2025.2.0-alpha.0, a login token named `token` is stored in a cookie for authentication purposes in Bull Dashboard, but this remains undeleted even af…
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High 7.4
Uncontrolled Recursion and Asymmetric Resource Consumption (Amplification) in media/file proxy in Misskey
Misskey is an open source, federated social media platform. In affected versions FileServerService (media proxy) in github.com/misskey-dev/misskey 2024.10.1 or earlier did not detect proxy loops, which allows remote actors to execute a self-propagating reflec…
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Medium 6.4
Server-Side Request Forgery vulnerability in various APIs in Misskey
Misskey is an open source, federated social media platform. Some APIs using `HttpRequestService` do not properly check the target host. This vulnerability allows an attacker to send POST or GET requests to the internal server, which may result in a SSRF attac…
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High 8.8
Missing validation allows spoofed profiles in Misskey
Misskey is an open source, federated social media platform. In affected versions missing validation in `ApRequestService.signedGet` allows an attacker to create fake user profiles that appear to be from a different instance than the one where they actually ex…
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High 8.8
Missing validation allows spoofed profiles and notes in Misskey
Misskey is an open source, federated social media platform. In affected versions missing validation in `ApRequestService.signedGet` and `HttpRequestService.getActivityJson` allows an attacker to create fake user profiles and forged notes. The spoofed users wi…
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Medium 6.9
Missing validation allows spoofed poll updates in Misskey
Misskey is an open source, federated social media platform. In affected versions missing validation in `ApInboxService.update` allows an attacker to modify the result of polls belonging to another user. No authentication is required, except for a valid signat…
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Medium 5.1
Missing validation allows spoofed "origin" links in Misskey
Misskey is an open source, federated social media platform.In affected versions missing validation in `NoteCreateService.insertNote`, `ApPersonService.createPerson`, and `ApPersonService.updatePerson` allows an attacker to control the target of any "origin" l…
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High 8.2
Misskey allows the impersonation and takeover of remote accounts with unnormalized signed activities
Misskey is an open source, decentralized microblogging platform. Misskey doesn't perform proper normalization on the JSON structures of incoming signed ActivityPub activity objects before processing them, allowing threat actors to spoof the contents of signed…
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High 7.1
Lack of media type verification of Activity Streams objects allows impersonation and takeover of remote accounts
Misskey is an open source, decentralized social media platform with ActivityPub support. Prior to version 2024.2.0, when fetching remote Activity Streams objects, Misskey doesn't check that the response from the remote server has a `Content-Type` header value…
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Critical 9.1
Misskey vulnerable to improper authorization when accessing with third-party application
Misskey is an open source, decentralized social media platform. Third-party applications may be able to access some endpoints or Websocket APIs that are incorrectly specified as [kind](https://github.com/misskey-dev/misskey/blob/406b4bdbe79b5b0b68fcdcb3c4b6e4…
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Critical 9.3
Misskey's missing signature validation allows arbitrary users to impersonate any remote user.
Misskey is an open source, decentralized social media platform. Misskey's missing signature validation allows arbitrary users to impersonate any remote user. This issue has been patched in version 2023.11.1-beta.1.
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High 7.5
Misskey allows users to bypass authentication of Bull dashboard
Misskey is an open source, decentralized social media platform. Prior to version 2023.9.0, by editing the URL, a user can bypass the authentication of the Bull dashboard, which is the job queue management UI, and access it. Version 2023.9.0 contains a fix. Th…
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High 7.1
Cross site scripting (XSS) vulnerability using authentication callback in Misskey
Misskey is an open source, decentralized social media platform. Due to insufficient validation of the redirect URL during `miauth` authentication in Misskey, arbitrary JavaScript can be executed when a user allows the link. All versions below 13.3.1 (includin…
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High 7.1
Cross site scripting (XSS) vulnerability using url preview in Misskey
Misskey is an open source, decentralized social media platform. In versions prior to 13.3.2 the URL preview function is subject to a cross site scripting vulnerability due to insufficient URL validation. Arbitrary JavaScript is executed when a malicious URL i…
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High 8.8
SQL injection of notes/search-by-tag
Misskey is an open source, decentralized social media platform. In versions prior to 13.3.3 SQL injection is possible due to insufficient parameter validation in the note search API by tag (notes/search-by-tag). This has been fixed in version 13.3.3. Users ar…
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High 7.1
Cross site scripting (XSS) of ActivityPub URI in misskey
Misskey is an open source, decentralized social media platform. In versions prior to 13.5.0 the link to the instance to the sender that appears when viewing a user or note received through ActivityPub is not properly validated, so by inserting a URL with a ja…
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High 7.7
Server-Side Request Forgery vulnerability in misskey
Misskey is an open source, decentralized microblogging platform. In affected versions a Server-Side Request Forgery vulnerability exists in "Upload from URL" and remote attachment handling. This could result in the disclosure of non-public information within …
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High 8.0
XSS vulnerability using dialog
Misskey is a decentralized microblogging platform. In versions of Misskey prior to 12.51.0, malicious actors can use the web client built-in dialog to display a malicious string, leading to cross-site scripting (XSS). XSS could compromise the API request toke…