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How CVE-2026-52800 Works
In Gogs version 0.14.1, a Cross-Site Request Forgery (CSRF) vulnerability exists in the organization team member management functionality. The core issue stems from a combination of insecure routing practices and insufficient CSRF protection mechanisms.
The vulnerability is rooted in how the application handles HTTP methods for state-changing operations. Specifically, the team action route is defined to accept both `GET` and `POST` requests:
m.Route("/teams/:team/action/:action", "GET,POST", org.TeamsAction)
This alone is not necessarily a flaw, but it becomes dangerous when combined with the application’s CSRF validation logic. The global CSRF check is implemented in the authentication context and is only triggered for `POST` requests:
if !options.SignOutRequired && !options.DisableCSRF &&
c.Req.Method == "POST" && !isAPIPath(c.Req.URL.Path) {
csrf.Validate(c.Context, c.csrf)
if c.Written() { return }
}
Because the CSRF validation is bypassed for `GET` requests, any state-changing operation reachable via `GET` is vulnerable to CSRF attacks.
The `TeamsAction` handler itself does not differentiate between HTTP methods. It performs operations like adding or removing team members based solely on query parameters (uid, uname) and the `:action` path parameter. When the `add` action is triggered via a `GET` request, the handler executes the following logic:
case "add":
if !c.Org.IsOwner { c.NotFound(); return }
uname := c.Query("uname")
var u database.User
u, err = database.Handle.Users().GetByUsername(c.Req.Context(), uname)
// ...
err = c.Org.Team.AddMember(u.ID)
Adding a user to the Owners team results in the `OrgUser.IsOwner` field being set to true, effectively granting that user organization owner–equivalent privileges.
An attacker can exploit this by crafting a malicious link and tricking a logged-in organization owner into visiting it. The victim’s browser will send a `GET` request to the vulnerable endpoint, adding an attacker-controlled user to the Owners team without any CSRF token validation. The impact is severe: the attacker gains full control over the organization’s repositories, settings, and members.
DailyCVE Form:
Platform: ……. Gogs
Version: …….. 0.14.1
Vulnerability :…… CSRF
Severity: ……. Medium (CVSS 6.5)
date: ………. 2026-06-23
Prediction: …… 2026-07-15
What Undercode Say:
Analytics from Undercode indicate that this vulnerability is particularly dangerous because it requires no user interaction beyond a simple link click. The attack vector is straightforward, and the privilege escalation is immediate. Organizations using Gogs 0.14.1 should prioritize patching.
Vulnerable Code Snippet (internal/cmd/web.go:390):
m.Route("/teams/:team/action/:action", "GET,POST", org.TeamsAction)
CSRF Bypass Logic (internal/context/auth.go:56-61):
if !options.SignOutRequired && !options.DisableCSRF &&
c.Req.Method == "POST" && !isAPIPath(c.Req.URL.Path) {
csrf.Validate(c.Context, c.csrf)
if c.Written() { return }
}
State-Changing Handler (internal/route/org/teams.go:38-83):
func TeamsAction(c context.Context) {
uid := com.StrTo(c.Query("uid")).MustInt64()
// ...
switch c.Params(":action") {
case "add":
// No method check; performs state change via GET
}
}
Exploit:
An attacker can exploit this vulnerability by crafting a URL like the following and tricking a logged-in organization owner into visiting it:
http://localhost:10880/org/org3/teams/owners/action/add?uid=1&uname=attacker
After the victim visits the link, the `attacker` user is added to the `Owners` team of the `org3` organization. The attacker can then access organization settings to confirm the privilege escalation:
http://localhost:10880/org/org3/settings
Protection:
To protect against this vulnerability, administrators should take the following actions:
1. Upgrade Gogs to a version where this issue has been fixed. According to security advisories, the fix is available in versions 0.14.1 and later. However, since this specific CVE affects 0.14.1, a patch release addressing this issue is expected.
2. Implement CSRF tokens for all state-changing operations, regardless of the HTTP method used.
3. Enforce HTTP method checks in handlers to ensure that `GET` requests are not used for state-changing operations.
4. Educate users about the risks of clicking on untrusted links while authenticated to the Gogs instance.
Impact:
Successful exploitation of this vulnerability allows an attacker to gain organization owner privileges, leading to:
– Full control over organization repositories, settings, and members.
– Unauthorized access to private repositories (confidentiality impact).
– Modification or deletion of repositories and settings (integrity impact).
– Repository deletion or disruption, leading to service unavailability (availability impact).
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
