How severe is GHSA-9rp6-23gf-4c3h?

GHSA-9rp6-23gf-4c3h has a CVSS score of 4.6/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-9rp6-23gf-4c3h?

GHSA-9rp6-23gf-4c3h affects the following packages: github.com/syncthing/syncthing (Go). Ecosystems affected: Go.

How do I fix GHSA-9rp6-23gf-4c3h?

Update github.com/syncthing/syncthing to 1.23.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9rp6-23gf-4c3h is resolved across your whole dependency graph.

How do I detect GHSA-9rp6-23gf-4c3h in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/syncthing/syncthing. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-9rp6-23gf-4c3h if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-9rp6-23gf-4c3h?

O3 pinpoints whether GHSA-9rp6-23gf-4c3h is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-9rp6-23gf-4c3h actively exploited in the wild?

Yes. There are 1 known exploit references for GHSA-9rp6-23gf-4c3h, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for GHSA-9rp6-23gf-4c3h?

GHSA-9rp6-23gf-4c3h has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 51th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-9rp6-23gf-4c3h?

GHSA-9rp6-23gf-4c3h is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-9rp6-23gf-4c3h published, and has it been updated?

GHSA-9rp6-23gf-4c3h was published on June 6, 2023 and was last updated on July 24, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

GHSA-9rp6-23gf-4c3h

MEDIUM

syncthing vulnerable to Cross-site Scripting (XSS) in Web GUI

Also known asBIT-syncthing-2022-46165CVE-2022-46165

Published

Jun 6, 2023

Updated

Jul 24, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk51th percentile+0.01%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐹github.com/syncthing/syncthing

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

A compromised instance with shared folders could sync malicious files which contain arbitrary HTML and JavaScript in the name. If the owner of another device looks over the shared folder settings and moves the mouse over the latest sync, a script could be executed to change settings for shared folders or add devices automatically.
Adding a new device with a malicious name could embed HTML or JavaScript inside parts of the page.

Risk

As long as trusted devices are used, the risk is low. Additionally, the web GUI is not used that often in daily use which reduces the likelihood of exploitation.

Details

1. Field "Latest Change"

Open the web GUI at http://127.0.0.1:8384/.
Create/Delete a file named <img src=a onerror=alert(123)> and sync it to the other instance.
Move your mouse over the latest change to trigger the tooltip.

Web browser source

<span tooltip="" data-original-title="\&quot;><img src=a onerror=alert(123)> @ 2022-11-30 16:58:43"
    aria-describedby="tooltip409527">
    <!-- ngIf: !folderStats[folder.id].lastFile.deleted --><span translate=""
        translate-value-file="&quot;><img src=a onerror=alert(123)>" ng-if="!folderStats[folder.id].lastFile.deleted"
        class="ng-scope">Updated "&gt;&lt;img src=a onerror=alert(123)&gt;</span>
    <!-- end ngIf: !folderStats[folder.id].lastFile.deleted -->
    <!-- ngIf: folderStats[folder.id].lastFile.deleted -->
</span>
<div class="tooltip fade top in" role="tooltip" id="tooltip409527"
    style="top: 446.033px; left: 318.3px; display: block;">
    <div class="tooltip-arrow" style="left: 50%;"></div>
    <div class="tooltip-inner">\"&gt;<img src="a" onerror="alert(123)"> @ 2022-11-30 16:58:43</div>
</div>

Corresponding code in the project

File gui/default/index.html:

<tr ng-if="folder.type != 'sendonly' && folder.type != 'receiveencrypted' && folderStats[folder.id].lastFile && folderStats[folder.id].lastFile.filename">
    <th><span class="fas fa-fw fa-exchange-alt"></span>&nbsp;<span translate>Latest Change</span></th>
    <td class="text-right">
        <span tooltip data-original-title="{{folderStats[folder.id].lastFile.filename}} @ {{folderStats[folder.id].lastFile.at | date:'yyyy-MM-dd HH:mm:ss'}}">
        <span translate translate-value-file="{{folderStats[folder.id].lastFile.filename | basename}}" ng-if="!folderStats[folder.id].lastFile.deleted">Updated {%file%}</span>
        <span translate translate-value-file="{{folderStats[folder.id].lastFile.filename | basename}}" ng-if="folderStats[folder.id].lastFile.deleted">Deleted {%file%}</span>
        </span>
    </td>
</tr>

File gui/default/syncthing/core/tooltipDirective.js:

angular.module('syncthing.core')
    .directive('tooltip', function () {
        return {
            restrict: 'A',
            link: function (scope, element, attributes) {
                $(element).tooltip({
                    html: 'true'
                });
            }
        };
    });

The attribute html should not be set to true or input sanitized.

2. Field "Shared With"

Open the web GUI at http://127.0.0.1:8384/.
Create a device with the following name fedora 1"'><h1>Headline</h1><img src=x><script>alert(1)</script>.
Add the device to another instance and share a folder.
Move your mouse over the malicious device name to trigger the tooltip.

Web browser source

<span tooltip="" data-original-title="fedora 1&quot;'><h1>Headline</h1><img src=x><script>alert(1)</script>  "
    ng-bind-html="sharesFolder(folder)" class="ng-binding" aria-describedby="tooltip348410">fedora 1"'&gt;<h1>Headline
    </h1><img src="x"></span>
<div class="tooltip fade top" role="tooltip" id="tooltip348410" style="top: 0px; left: 0px; display: block;">
    <div class="tooltip-arrow" style="left: 50%;"></div>
    <div class="tooltip-inner">fedora 1"'&gt;<h1>Headline</h1><img src="x">
        <script>alert(1)</script>
    </div>
</div>

Corresponding code in the project

File gui/default/index.html:

<tr>
    <th><span class="fas fa-fw fa-share-alt"></span>&nbsp;<span translate>Shared With</span></th>
    <td class="text-right">
        <span tooltip data-original-title="{{sharesFolder(folder)}} {{folderHasUnacceptedDevices(folder) ? '<br/>(<sup>1</sup>' + ('The remote device has not accepted sharing this folder.' | translate) + ')' : ''}} {{folderHasPausedDevices(folder) ? '<br/>(<sup>2</sup>' + ('The remote device has paused this folder.' | translate) + ')' : ''}}" ng-bind-html="sharesFolder(folder)"></span>
    </td>
</tr>

File gui/default/syncthing/core/tooltipDirective.js:

angular.module('syncthing.core')
    .directive('tooltip', function () {
        return {
            restrict: 'A',
            link: function (scope, element, attributes) {
                $(element).tooltip({
                    html: 'true'
                });
            }
        };
    });

The attribute html should not be set to true or input sanitized.

HTML Injection in "Edit Folder"

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/syncthing/syncthing`	all versions	1.23.5

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Syncthing is an open source, continuous file synchronization program. In…

github.comNVDJun 2023

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/syncthing/syncthing. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/syncthing/syncthing to 1.23.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9rp6-23gf-4c3h is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-9rp6-23gf-4c3h is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-9rp6-23gf-4c3h. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

## Impact 1. A compromised instance with shared folders could sync malicious files which contain arbitrary HTML and JavaScript in the name. If the owner of another device looks over the shared folder settings and moves the mouse over the latest sync, a script could be executed to change settings for shared folders or add devices automatically. 2. Adding a new device with a malicious name could embed HTML or JavaScript inside parts of the page. ## Risk As long as trusted devices are used, the risk is low. Additionally, the web GUI is not used that often in daily use which reduces the likeli

O3 Security · Impact-Aware SCA

Is GHSA-9rp6-23gf-4c3h in your dependencies?

O3 detects GHSA-9rp6-23gf-4c3h across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works

CVSS Score

4.6/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

Low

UI:User Interaction

Required

S:Scope

Unchanged

C:Confidentiality

Low

I:Integrity

Low

A:Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No known public exploit tooling found.

Timeline

Disclosed

Jun 6, 2023

First exploit

Jun 13, 2023

7 days after disclosure — rapid exploitation

Last updated

Jul 24, 2024

Identifiers

GHSA-9rp6-23gf-4c3h

BIT-syncthing-2022-46165

References

Advisorynvd.nist.gov Webgithub.com Webgithub.com Webgithub.com Webgithub.com Weblists.fedoraproject.org Weblists.fedoraproject.org Packagegithub.com

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.

GHSA-9rp6-23gf-4c3h

EPSS Exploitation Probability

Blast Radius

Description

Impact

Risk

Details

1. Field "Latest Change"

Web browser source

Corresponding code in the project

2. Field "Shared With"

Web browser source

Corresponding code in the project

HTML Injection in "Edit Folder"

Affected Packages

Detection & mitigation playbook

Detect

Fix

Workarounds

How O3 protects you

Frequently Asked Questions

Is GHSA-9rp6-23gf-4c3h in your dependencies?